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CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 01.07.2025 07.48 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3487
Begin Time: 2025 Jun 27 1310 UTC
Yesterday Maximum 2MeV Flux: 8730 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WARNING
Geomagnetic K-index of 4 expected
Issued: 01.07.2025 01.12 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 01 0112 UTC
Valid To: 2025 Jul 01 0900 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G1 Predicted
Issued: 30.06.2025 18.56 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jul 01: None (Below G1) Jul 02: G1 (Minor) Jul 03: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: A CME that left the Sun on 28 June is anticipated to arrive at Earth early to mid UTC day on 02 July and will likely result in G1 (Minor) geomagnetic storming. Lingering CME effects will likely continue into 03 July causing continued, isolated minor storming periods.

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 30.06.2025 05.15 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3486
Begin Time: 2025 Jun 27 1310 UTC
Yesterday Maximum 2MeV Flux: 6349 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 30.06.2025 00.10 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 30: None (Below G1) Jul 01: None (Below G1) Jul 02: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 29.06.2025 05.11 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3485
Begin Time: 2025 Jun 27 1310 UTC
Yesterday Maximum 2MeV Flux: 4190 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 28.06.2025 05.10 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3484
Begin Time: 2025 Jun 27 1310 UTC
Yesterday Maximum 2MeV Flux: 2047 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 27.06.2025 17.26 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5014
Valid From: 2025 Jun 25 1722 UTC
Now Valid Until: 2025 Jun 28 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 27.06.2025 13.27 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Jun 27 1310 UTC
Station: GOES19

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 27.06.2025 05.46 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5013
Valid From: 2025 Jun 25 1722 UTC
Now Valid Until: 2025 Jun 27 2100 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Publié: 27.06.2025 01.39 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 27 0139 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-Index of 6 expected
Publié: 26.06.2025 22.35 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Jun 26 2235 UTC
Valid To: 2025 Jun 27 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 26.06.2025 22.31 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 26 2230 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 5 expected
Publié: 26.06.2025 22.22 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jun 26 2222 UTC
Valid To: 2025 Jun 27 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 26.06.2025 17.54 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5012
Valid From: 2025 Jun 25 1722 UTC
Now Valid Until: 2025 Jun 27 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 26.06.2025 11.25 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5011
Valid From: 2025 Jun 25 1722 UTC
Now Valid Until: 2025 Jun 26 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Publié: 25.06.2025 20.27 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jun 25 2026 UTC
Valid To: 2025 Jun 26 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Publié: 25.06.2025 20.05 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 25 2005 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 25.06.2025 18.31 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 26: G1 (Minor) Jun 27: G1 (Minor) Jun 28: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: G1 (Minor) geomagnetic storming is likely 26-27 June due to recurrent, negative poliarty coronal hole high speed stream effects.

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 4 expected
Publié: 25.06.2025 17.22 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 25 1722 UTC
Valid To: 2025 Jun 26 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 25.06.2025 13.24 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3482
Begin Time: 2025 Jun 23 1425 UTC
Yesterday Maximum 2MeV Flux: 1370 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 24.06.2025 14.47 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3481
Begin Time: 2025 Jun 23 1425 UTC
Yesterday Maximum 2MeV Flux: 1270 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WATCH
Geomagnetic Storm Category G2 Predicted
Publié: 23.06.2025 17.00 UTC
Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Jun 24: None (Below G1) Jun 25: G2 (Moderate) Jun 26: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: Recurrent, negative polarity coronal hole high speed stream influence is likely to bring minor to moderate geomagnetic storming 25-26 Jun.

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 23.06.2025 14.40 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Jun 23 1425 UTC
Station: GOES19

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 22.06.2025 21.16 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 23: None (Below G1) Jun 24: None (Below G1) Jun 25: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Publié: 22.06.2025 03.02 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 22 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Publié: 22.06.2025 01.42 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 22 0140 UTC
Valid To: 2025 Jun 22 1500 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 4
Publié: 21.06.2025 18.01 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 21 1759 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Publié: 21.06.2025 05.38 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 21 0537 UTC
Valid To: 2025 Jun 21 2359 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 20.06.2025 11.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5007
Valid From: 2025 Jun 19 1912 UTC
Now Valid Until: 2025 Jun 20 2359 UTC
Warning Condition: persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

SUMMARY
X-ray Event exceeded X1
Publié: 20.06.2025 00.14 UTC
X-ray Event exceeded X1
Begin Time: 2025 Jun 19 2337 UTC
Maximum Time: 2025 Jun 19 2350 UTC
End Time: 2025 Jun 19 2354 UTC
X-ray Class: X1.9
Location: N18W38
NOAA Scale: R3 - Strong

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

SUMMARY
10cm Radio Burst
Publié: 19.06.2025 23.58 UTC
10cm Radio Burst
Begin Time: 2025 Jun 19 2346 UTC
Maximum Time: 2025 Jun 19 2347 UTC
End Time: 2025 Jun 19 2347 UTC
Duration: 1 minutes
Peak Flux: 250 sfu
Latest Penticton Noon Flux: 137 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

ALERT
X-Ray Flux exceeded M5
Publié: 19.06.2025 23.48 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2025 Jun 19 2347 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

ALERT
Geomagnetic K-index of 4
Publié: 19.06.2025 20.42 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 19 2038 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Publié: 19.06.2025 19.14 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 19 1912 UTC
Valid To: 2025 Jun 20 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 4
Publié: 18.06.2025 23.33 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 18 2327 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Publié: 18.06.2025 23.29 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 18 2329 UTC
Valid To: 2025 Jun 19 0600 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Type II Radio Emission
Publié: 18.06.2025 05.01 UTC
Type II Radio Emission
Begin Time: 2025 Jun 18 0434 UTC
Estimated Velocity: 1110 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

WARNING
Geomagnetic K-index of 4 expected
Publié: 18.06.2025 01.28 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 18 0128 UTC
Valid To: 2025 Jun 18 0900 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

SUMMARY
10cm Radio Burst
Publié: 17.06.2025 22.37 UTC
10cm Radio Burst
Begin Time: 2025 Jun 17 2146 UTC
Maximum Time: 2025 Jun 17 2147 UTC
End Time: 2025 Jun 17 2147 UTC
Duration: 1 minutes
Peak Flux: 200 sfu
Latest Penticton Noon Flux: 139 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

SUMMARY
X-ray Event exceeded X1
Publié: 17.06.2025 22.04 UTC
X-ray Event exceeded X1
Begin Time: 2025 Jun 17 2138 UTC
Maximum Time: 2025 Jun 17 2149 UTC
End Time: 2025 Jun 17 2154 UTC
X-ray Class: X1.2
Optical Class: 2b
Location: N18W10
NOAA Scale: R3 - Strong

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

ALERT
X-Ray Flux exceeded M5
Publié: 17.06.2025 21.50 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2025 Jun 17 2147 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 17.06.2025 20.27 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 18: None (Below G1) Jun 19: None (Below G1) Jun 20: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 17.06.2025 13.50 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Jun 17 1340 UTC
Station: GOES19

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

SUMMARY
X-ray Event exceeded M5
Publié: 16.06.2025 10.13 UTC
X-ray Event exceeded M5
Begin Time: 2025 Jun 16 0917 UTC
Maximum Time: 2025 Jun 16 0938 UTC
End Time: 2025 Jun 16 0948 UTC
X-ray Class: M6.5
Location: N18E06
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

SUMMARY
10cm Radio Burst
Publié: 16.06.2025 10.11 UTC
10cm Radio Burst
Begin Time: 2025 Jun 16 0933 UTC
Maximum Time: 2025 Jun 16 0934 UTC
End Time: 2025 Jun 16 0941 UTC
Duration: 8 minutes
Peak Flux: 530 sfu
Latest Penticton Noon Flux: 12 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

ALERT
X-Ray Flux exceeded M5
Publié: 16.06.2025 09.38 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2025 Jun 16 0935 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

ALERT
Geomagnetic K-index of 4
Publié: 16.06.2025 07.48 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 16 0746 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Publié: 16.06.2025 07.10 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 16 0710 UTC
Valid To: 2025 Jun 16 2359 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Type II Radio Emission
Publié: 16.06.2025 02.15 UTC
Type II Radio Emission
Begin Time: 2025 Jun 16 0151 UTC
Estimated Velocity: 1108 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

ALERT
Type IV Radio Emission
Publié: 15.06.2025 18.41 UTC
Type IV Radio Emission
Begin Time: 2025 Jun 15 1800 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

ALERT
Type II Radio Emission
Publié: 15.06.2025 18.41 UTC
Type II Radio Emission
Begin Time: 2025 Jun 15 1819 UTC
Estimated Velocity: 397 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

SUMMARY
X-ray Event exceeded M5
Publié: 15.06.2025 18.40 UTC
X-ray Event exceeded M5
Begin Time: 2025 Jun 15 1745 UTC
Maximum Time: 2025 Jun 15 1807 UTC
End Time: 2025 Jun 15 1825 UTC
X-ray Class: M8.4
Optical Class: sf
Location: N17E16
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

SUMMARY
10cm Radio Burst
Publié: 15.06.2025 18.25 UTC
10cm Radio Burst
Begin Time: 2025 Jun 15 1755 UTC
Maximum Time: 2025 Jun 15 1800 UTC
End Time: 2025 Jun 15 1810 UTC
Duration: 15 minutes
Peak Flux: 1800 sfu
Latest Penticton Noon Flux: 151 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

ALERT
X-Ray Flux exceeded M5
Publié: 15.06.2025 18.05 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2025 Jun 15 1800 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

ALERT
X-Ray Flux exceeded M5
Publié: 15.06.2025 18.03 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2025 Jun 15 1800 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

ALERT
Type II Radio Emission
Publié: 15.06.2025 08.23 UTC
Type II Radio Emission
Begin Time: 2025 Jun 15 0756 UTC
Estimated Velocity: 485 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

SUMMARY
X-ray Event exceeded M5
Publié: 14.06.2025 23.29 UTC
X-ray Event exceeded M5
Begin Time: 2025 Jun 14 2251 UTC
Maximum Time: 2025 Jun 14 2301 UTC
End Time: 2025 Jun 14 2309 UTC
X-ray Class: M6.8
Location: S16W73
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

ALERT
X-Ray Flux exceeded M5
Publié: 14.06.2025 22.59 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2025 Jun 14 2258 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 14.06.2025 17.23 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5002
Valid From: 2025 Jun 11 1710 UTC
Now Valid Until: 2025 Jun 15 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Publié: 14.06.2025 04.53 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 14 0453 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Publié: 14.06.2025 03.02 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 14 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 6
Publié: 13.06.2025 23.30 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 13 2328 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 13.06.2025 22.23 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 13 2220 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 13.06.2025 20.54 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2068
Valid From: 2025 Jun 12 2020 UTC
Now Valid Until: 2025 Jun 14 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 13.06.2025 20.54 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5001
Valid From: 2025 Jun 11 1710 UTC
Now Valid Until: 2025 Jun 14 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 13.06.2025 20.54 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 14: G2 (Moderate) Jun 15: G1 (Minor) Jun 16: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Publié: 13.06.2025 20.54 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 594
Valid From: 2025 Jun 13 1331 UTC
Now Valid Until: 2025 Jun 14 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 6
Publié: 13.06.2025 20.14 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 13 2013 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 13.06.2025 19.16 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 13 1916 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Publié: 13.06.2025 16.56 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 13 1656 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 6
Publié: 13.06.2025 13.56 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 13 1356 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 13.06.2025 13.32 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2067
Valid From: 2025 Jun 12 2020 UTC
Now Valid Until: 2025 Jun 13 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-Index of 6 expected
Publié: 13.06.2025 13.31 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Jun 13 1331 UTC
Valid To: 2025 Jun 13 2100 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 13.06.2025 13.00 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 13 1300 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 13.06.2025 11.33 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5000
Valid From: 2025 Jun 11 1710 UTC
Now Valid Until: 2025 Jun 13 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 13.06.2025 11.32 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2066
Valid From: 2025 Jun 12 2020 UTC
Now Valid Until: 2025 Jun 13 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Publié: 13.06.2025 08.27 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 13 0814 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 13.06.2025 06.09 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4999
Valid From: 2025 Jun 11 1710 UTC
Now Valid Until: 2025 Jun 13 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 6
Publié: 13.06.2025 06.08 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 13 0559 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 13.06.2025 05.55 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2065
Valid From: 2025 Jun 12 2020 UTC
Now Valid Until: 2025 Jun 13 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Publié: 13.06.2025 05.54 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 592
Valid From: 2025 Jun 12 2206 UTC
Now Valid Until: 2025 Jun 13 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 13.06.2025 03.46 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 13 0337 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 7 or greater expected
Publié: 13.06.2025 00.48 UTC
Geomagnetic K-index of 7 or greater expected
Valid From: 2025 Jun 13 0048 UTC
Valid To: 2025 Jun 13 0600 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

ALERT
Geomagnetic K-index of 6
Publié: 13.06.2025 00.38 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 13 0029 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 13.06.2025 00.25 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 13 0022 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Publié: 12.06.2025 23.13 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 12 2307 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-Index of 6 expected
Publié: 12.06.2025 22.06 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Jun 12 2206 UTC
Valid To: 2025 Jun 13 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 12.06.2025 22.05 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4998
Valid From: 2025 Jun 11 1710 UTC
Now Valid Until: 2025 Jun 13 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 12.06.2025 22.05 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2064
Valid From: 2025 Jun 12 2020 UTC
Now Valid Until: 2025 Jun 13 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Publié: 12.06.2025 20.34 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 12 2035 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 5 expected
Publié: 12.06.2025 20.21 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jun 12 2020 UTC
Valid To: 2025 Jun 13 0300 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 12.06.2025 17.51 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4997
Valid From: 2025 Jun 11 1710 UTC
Now Valid Until: 2025 Jun 13 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 12.06.2025 11.36 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4996
Valid From: 2025 Jun 11 1710 UTC
Now Valid Until: 2025 Jun 12 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 12.06.2025 05.09 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2062
Valid From: 2025 Jun 11 2255 UTC
Now Valid Until: 2025 Jun 12 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Publié: 12.06.2025 03.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 12 0243 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Publié: 11.06.2025 23.46 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 11 2341 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 11.06.2025 22.59 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4995
Valid From: 2025 Jun 11 1710 UTC
Now Valid Until: 2025 Jun 12 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Publié: 11.06.2025 22.55 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jun 11 2255 UTC
Valid To: 2025 Jun 12 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WATCH
Geomagnetic Storm Category G2 Predicted
Publié: 11.06.2025 19.26 UTC
Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Jun 12: None (Below G1) Jun 13: None (Below G1) Jun 14: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 4
Publié: 11.06.2025 18.01 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 11 1759 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Publié: 11.06.2025 17.10 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 11 1710 UTC
Valid To: 2025 Jun 12 0100 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Publié: 11.06.2025 00.30 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 11 0030 UTC
Valid To: 2025 Jun 11 0600 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 09.06.2025 10.54 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4992
Valid From: 2025 Jun 07 0843 UTC
Now Valid Until: 2025 Jun 09 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Publié: 08.06.2025 21.37 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jun 08 2136 UTC
Valid To: 2025 Jun 09 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 08.06.2025 21.28 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4991
Valid From: 2025 Jun 07 0843 UTC
Now Valid Until: 2025 Jun 09 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 08.06.2025 05.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4990
Valid From: 2025 Jun 07 0843 UTC
Now Valid Until: 2025 Jun 08 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Publié: 07.06.2025 21.07 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 07 2059 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 5 expected
Publié: 07.06.2025 21.06 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jun 07 2159 UTC
Valid To: 2025 Jun 08 0300 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 07.06.2025 18.15 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4989
Valid From: 2025 Jun 07 0843 UTC
Now Valid Until: 2025 Jun 08 0600 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 07.06.2025 18.12 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 08: G1 (Minor) Jun 09: G1 (Minor) Jun 10: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Publié: 07.06.2025 08.50 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 07 0850 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Publié: 07.06.2025 08.43 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 07 0843 UTC
Valid To: 2025 Jun 07 2359 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 06.06.2025 06.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3478
Begin Time: 2025 Jun 02 1505 UTC
Yesterday Maximum 2MeV Flux: 2215 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 05.06.2025 20.52 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4987
Valid From: 2025 May 28 1747 UTC
Now Valid Until: 2025 Jun 06 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 05.06.2025 11.52 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3477
Begin Time: 2025 Jun 02 1505 UTC
Yesterday Maximum 2MeV Flux: 1020 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 05.06.2025 11.40 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4986
Valid From: 2025 May 28 1747 UTC
Now Valid Until: 2025 Jun 05 2100 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 04.06.2025 21.18 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 05: G2 (Moderate) Jun 06: None (Below G1) Jun 07: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 04.06.2025 21.12 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4985
Valid From: 2025 May 28 1747 UTC
Now Valid Until: 2025 Jun 05 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 04.06.2025 21.10 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2058
Valid From: 2025 Jun 04 1248 UTC
Now Valid Until: 2025 Jun 05 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 04.06.2025 20.56 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2057
Valid From: 2025 Jun 04 1248 UTC
Now Valid Until: 2025 Jun 05 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Publié: 04.06.2025 20.56 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 590
Valid From: 2025 Jun 04 1404 UTC
Now Valid Until: 2025 Jun 05 0600 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 04.06.2025 16.20 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 04 1619 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-Index of 6 expected
Publié: 04.06.2025 14.04 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Jun 04 1404 UTC
Valid To: 2025 Jun 04 2100 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 04.06.2025 13.58 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 04 1358 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 5 expected
Publié: 04.06.2025 12.51 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jun 04 1248 UTC
Valid To: 2025 Jun 04 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 04.06.2025 12.51 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4984
Valid From: 2025 May 28 1747 UTC
Now Valid Until: 2025 Jun 04 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 04.06.2025 08.20 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4983
Valid From: 2025 May 28 1747 UTC
Now Valid Until: 2025 Jun 04 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 04.06.2025 05.00 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3476
Begin Time: 2025 Jun 02 1505 UTC
Yesterday Maximum 2MeV Flux: 2400 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 03.06.2025 18.12 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4982
Valid From: 2025 May 28 1747 UTC
Now Valid Until: 2025 Jun 04 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 03.06.2025 17.59 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2055
Valid From: 2025 Jun 01 0054 UTC
Now Valid Until: 2025 Jun 04 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Publié: 03.06.2025 16.32 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 03 1632 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 6
Publié: 03.06.2025 14.59 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 03 1459 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 03.06.2025 14.07 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 03 1407 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Publié: 03.06.2025 11.11 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 03 1103 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 03.06.2025 11.10 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2054
Valid From: 2025 Jun 01 0054 UTC
Now Valid Until: 2025 Jun 03 2100 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 03.06.2025 11.10 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2053
Valid From: 2025 Jun 01 0054 UTC
Now Valid Until: 2025 Jun 03 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Publié: 03.06.2025 11.10 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 588
Valid From: 2025 Jun 01 0540 UTC
Now Valid Until: 2025 Jun 03 2100 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 6
Publié: 03.06.2025 07.29 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 03 0722 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 03.06.2025 06.32 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 03 0624 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 03.06.2025 06.07 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3475
Begin Time: 2025 Jun 02 1505 UTC
Yesterday Maximum 2MeV Flux: 3370 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 7
Publié: 03.06.2025 05.35 UTC
Geomagnetic K-index of 7
Threshold Reached: 2025 Jun 03 0533 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

ALERT
Geomagnetic K-index of 6
Publié: 03.06.2025 03.51 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 03 0346 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 03.06.2025 03.32 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 03 0330 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 6
Publié: 03.06.2025 03.11 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 03 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 03.06.2025 01.14 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 03 0114 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 6
Publié: 03.06.2025 00.05 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 02 2359 UTC
Synoptic Period: 2100-0000 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 02.06.2025 22.06 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 02 2205 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

SUMMARY
Proton Event 10MeV Integral Flux exceeded 10pfu
Publié: 02.06.2025 20.52 UTC
Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 May 31 1710 UTC
Maximum Time: 2025 Jun 01 0915 UTC
End Time: 2025 Jun 02 0520 UTC
Maximum 10MeV Flux: 666 pfu
NOAA Scale: S2 - Moderate

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Publié: 02.06.2025 20.52 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 587
Valid From: 2025 Jun 01 0540 UTC
Now Valid Until: 2025 Jun 03 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 02.06.2025 20.52 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 03: G2 (Moderate) Jun 04: G1 (Minor) Jun 05: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 7 or greater expected
Publié: 02.06.2025 20.52 UTC
Geomagnetic K-index of 7 or greater expected
Extension to Serial Number: 129
Valid From: 2025 Jun 02 1105 UTC
Now Valid Until: 2025 Jun 03 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

ALERT
Geomagnetic K-index of 5
Publié: 02.06.2025 19.31 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 02 1931 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Publié: 02.06.2025 17.15 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 02 1715 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 02.06.2025 15.13 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Jun 02 1505 UTC
Station: GOES19

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 6
Publié: 02.06.2025 13.48 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 02 1347 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 02.06.2025 12.34 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 02 1233 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 7
Publié: 02.06.2025 11.24 UTC
Geomagnetic K-index of 7
Threshold Reached: 2025 Jun 02 1120 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 02.06.2025 11.05 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2052
Valid From: 2025 Jun 01 0054 UTC
Now Valid Until: 2025 Jun 03 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 02.06.2025 11.05 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4981
Valid From: 2025 May 28 1747 UTC
Now Valid Until: 2025 Jun 03 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Publié: 02.06.2025 11.05 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 586
Valid From: 2025 Jun 01 0540 UTC
Now Valid Until: 2025 Jun 02 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

WARNING
Geomagnetic K-index of 7 or greater expected
Publié: 02.06.2025 11.05 UTC
Geomagnetic K-index of 7 or greater expected
Valid From: 2025 Jun 02 1105 UTC
Valid To: 2025 Jun 02 2100 UTC
Warning Condition: Persistence
NOAA Scale: G3 or greater

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

ALERT
Geomagnetic K-index of 6
Publié: 02.06.2025 10.26 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 02 1023 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 02.06.2025 09.27 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 02 0924 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 6
Publié: 02.06.2025 08.44 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Jun 02 0840 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Publié: 02.06.2025 08.10 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 02 0806 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Publié: 02.06.2025 04.57 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 02 0449 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Publié: 02.06.2025 01.37 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 02 0135 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Table

Date Radio flux 10.7 cm SESC Le nombre des taches solaires Tache de la zone 10E-6 De nouvelles régions GOES15 X-ray Bkgd flux éclairs
X-ray Optique
C M X S 1 2 3
01-06-2025 150 97 780 0 * 10 0 0 4 1 0 0
02-06-2025 140 103 700 0 * 5 2 0 1 0 1 0
03-06-2025 135 95 590 1 * 6 1 0 2 0 0 0
04-06-2025 134 92 540 1 * 5 1 0 3 0 0 0
05-06-2025 128 92 460 0 * 12 0 0 8 0 0 0
06-06-2025 128 76 270 1 * 13 0 0 10 0 0 0
07-06-2025 121 103 240 2 * 7 0 0 2 0 0 0
08-06-2025 115 87 150 0 * 4 0 0 3 0 0 0
09-06-2025 120 82 160 2 * 3 0 0 2 0 0 0
10-06-2025 129 105 370 1 * 11 0 0 6 0 0 0
11-06-2025 141 133 655 2 * 11 0 0 7 0 0 0
12-06-2025 142 116 905 1 * 6 0 0 2 1 0 0
13-06-2025 143 134 890 0 * 5 1 0 12 1 0 0
14-06-2025 151 136 1150 1 * 13 2 0 10 1 0 0
15-06-2025 161 141 1250 0 * 12 4 0 20 2 0 0
16-06-2025 148 125 700 0 * 6 4 0 5 2 0 0
17-06-2025 139 97 600 0 * 6 1 1 12 0 1 0
18-06-2025 137 120 660 1 * 20 0 0 20 0 0 0
19-06-2025 136 113 890 1 * 9 0 1 14 1 0 0
20-06-2025 130 95 470 0 * 4 2 0 1 2 0 0
21-06-2025 120 87 710 0 * 1 0 0 0 0 0 0
22-06-2025 125 80 630 0 * 7 0 0 2 0 0 0
23-06-2025 122 105 470 3 * 7 0 0 2 0 0 0
24-06-2025 120 87 305 0 * 7 0 0 2 0 0 0
25-06-2025 117 90 320 1 * 4 0 0 7 0 0 0
26-06-2025 117 91 340 0 * 3 0 0 6 0 0 0
27-06-2025 118 111 340 3 * 3 0 0 3 0 0 0
28-06-2025 122 103 380 1 * 2 0 0 0 1 0 0
29-06-2025 128 151 380 2 * 2 0 0 0 0 0 0
30-06-2025 128 158 330 2 * 7 0 0 1 0 0 0
Moyenne/Total 132 107 555 26 211 18 2 167 12 2 0

Graphique de synthèse

éclairs

Solar wind

Solar Wind

Le vent solaire est un flux de plasma libéré de la haute atmosphère du Soleil. Il se compose principalement d'électrons, de protons et de particules alpha avec des énergies généralement comprises entre 1,5 et 10 keV. Le flux de particules varie en densité, température et vitesse dans le temps et sur la longitude solaire. Ces particules peuvent échapper à la gravité du Soleil en raison de leur haute énergie, de la température élevée de la couronne et des phénomènes magnétiques, électriques et électromagnétiques qu'elle contient.

Le vent solaire est divisé en deux composantes, respectivement appelées le vent solaire lent et le vent solaire rapide. Le vent solaire lent a une vitesse d'environ 400 km / s, une température de 1,4–1,6 × 10e6 K et une composition proche de la couronne. En revanche, le vent solaire rapide a une vitesse typique de 750 km / s, une température de 8 × 10e5 K et il correspond presque à la composition de la photosphère du Soleil. Le vent solaire lent est deux fois plus dense et plus variable en intensité que le vent solaire rapide. Le vent lent a également une structure plus complexe, avec des régions turbulentes et des structures à grande échelle.

Solar radio flux at 10.7 cm

Solar radio flux at 10.7 cm

Le flux radioélectrique solaire à 10,7 cm (2800 MHz) est un excellent indicateur de l'activité solaire. Souvent appelé indice F10.7, c'est l'un des enregistrements les plus anciens d'activité solaire. Les émissions radio F10.7 proviennent de haut dans la chromosphère et bas dans la couronne de l'atmosphère solaire. Le F10.7 est bien corrélé avec le nombre de taches solaires ainsi qu'avec un certain nombre d'enregistrements d'irradiance solaire UltraViolet (UV) et visible. Rapporté en «unités de flux solaire» (s.f.u.), le F10.7 peut varier de moins de 50 s.f.u., à plus de 300 s.f.u., au cours d'un cycle solaire.

Flares

Flares

Une éruption solaire est un éclair soudain de luminosité observé à la surface du Soleil ou sur le flanc solaire, qui est interprété comme une importante libération d'énergie allant jusqu'à 6 × 10e25 joules d'énergie. Ils sont souvent, mais pas toujours, suivis d'une éjection de masse coronale colossale. La fusée éjecte des nuages ​​d'électrons, d'ions et d'atomes à travers la couronne du soleil dans l'espace. Ces nuages ​​atteignent généralement la Terre un jour ou deux après l'événement.

Les éruptions solaires affectent toutes les couches de l'atmosphère solaire (photosphère, chromosphère et couronne), lorsque le milieu plasma est chauffé à des dizaines de millions de kelvin, tandis que les électrons, les protons et les ions plus lourds sont accélérés à près de la vitesse de la lumière. Ils produisent un rayonnement à travers le spectre électromagnétique à toutes les longueurs d'onde, des ondes radio aux rayons gamma, bien que la plupart de l'énergie soit répartie sur des fréquences en dehors de la plage visuelle et pour cette raison, la majorité des fusées éclairantes ne sont pas visibles à l'œil nu et doivent être observé avec des instruments spéciaux. Les éruptions se produisent dans les régions actives autour des taches solaires, où des champs magnétiques intenses pénètrent dans la photosphère pour relier la couronne à l'intérieur solaire. Les fusées éclairantes sont alimentées par la libération soudaine (de quelques minutes à des dizaines de minutes) d'énergie magnétique stockée dans la couronne. Les mêmes rejets d'énergie peuvent produire des éjections de masse coronale (CME), bien que la relation entre les CME et les éruptions ne soit pas encore bien établie.

La fréquence d'apparition des éruptions solaires varie, de plusieurs par jour lorsque le Soleil est particulièrement «actif» à moins d'une par semaine lorsque le Soleil est «calme», suivant le cycle de 11 ans (le cycle solaire). Les grosses fusées éclairantes sont moins fréquentes que les plus petites.

Classification

Les éruptions solaires sont classées comme A, B, C, M ou X selon le flux de pointe (en watts par mètre carré, W / m2) de rayons X de 100 à 800 picomètres près de la Terre, tel que mesuré sur le vaisseau spatial GOES.

Classification Peak Flux Range at 100-800 picometer
W/m2
A < 10e-7
B 10e-7 to 10e-6
C 10e-6 to 10e-5
M 10e-5 to 10e-4
X 10e-4 to 10e-3
Z > 10e-3

An earlier flare classification is based on Hα spectral observations. The scheme uses both the intensity and emitting surface. The classification in intensity is qualitative, referring to the flares as: (f)aint, (n)ormal or (b)rilliant. The emitting surface is measured in terms of millionths of the hemisphere and is described below. (The total hemisphere area AH = 6.2 × 1012 km2.)

Classification Corrected area
(millionths of hemisphere)
S < 100
1 100 - 250
2 250 - 600
3 600 - 1200
4 > 1200

Sunspot number

Sunspots

Les taches solaires sont des phénomènes temporaires sur la photosphère du Soleil qui apparaissent visiblement comme des taches sombres par rapport aux régions environnantes. Ils correspondent à des concentrations de champ magnétique qui inhibent la convection et entraînent une température de surface réduite par rapport à la photosphère environnante. Les taches solaires apparaissent généralement par paires, avec des membres de paires de polarité magnétique opposée. Le nombre de taches solaires varie en fonction du cycle solaire d'environ 11 ans.

Les populations de taches solaires augmentent rapidement et diminuent plus lentement selon un cycle irrégulier de 11 ans, bien que des variations significatives du nombre de taches solaires observant la période de 11 ans soient connues sur des périodes plus longues. Par exemple, de 1900 aux années 1960, la tendance des maxima solaires du nombre de taches solaires a été à la hausse; des années 1960 à nos jours, il a quelque peu diminué. Au cours des dernières décennies, le Soleil a eu un niveau moyen d'activité des taches solaires nettement élevé; il était également actif pour la dernière fois il y a plus de 8 000 ans.

Le nombre de taches solaires est en corrélation avec l'intensité du rayonnement solaire au cours de la période depuis 1979, lorsque les mesures par satellite du flux radiatif absolu sont devenues disponibles. Étant donné que les taches solaires sont plus sombres que la photosphère environnante, on peut s'attendre à ce que plus de taches solaires conduisent à moins de rayonnement solaire et à une constante solaire diminuée. Cependant, les marges environnantes des taches solaires sont plus lumineuses que la moyenne et sont donc plus chaudes; Dans l'ensemble, plus de taches solaires augmentent la constante solaire ou la luminosité du Soleil. La variation causée par le cycle des taches solaires à la production solaire est relativement faible, de l'ordre de 0,1% de la constante solaire (une plage pic à creux de 1,3 W / m2 contre 1366 W / m2 pour la constante solaire moyenne).

K-indices



Aujourd’hui


0h
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3h
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9h
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12h
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- 1. 00 - 1. 00 - 1.



Data


Estimated Planetary

Estimated Planetary

Date A K-indices (UTC)
0h 3h 6h 9h 12h 15h 18h 21h
03-06-2025 58 5. 67 7. 00 6.
04-06-2025 26 1. 33 3. 67 3.
05-06-2025 12 3. 67 2. 33 2.
06-06-2025 8 2. 33 2. 00 2.
07-06-2025 20 2. 00 2. 00 4.
08-06-2025 15 2. 33 2. 33 2.
09-06-2025 15 3. 67 4. 33 2.
10-06-2025 9 2. 67 1. 67 2.
11-06-2025 18 3. 33 2. 67 1.
12-06-2025 33 4. 67 4. 33 4.
13-06-2025 66 6. 33 5. 67 5.
14-06-2025 24 4. 67 5. 33 3.
15-06-2025 10 2. 00 1. 67 2.
16-06-2025 10 2. 00 2. 33 3.
17-06-2025 9 2. 00 2. 00 2.
18-06-2025 13 3. 33 2. 33 2.
19-06-2025 12 3. 00 1. 67 2.
20-06-2025 9 1. 33 2. 00 3.
21-06-2025 12 2. 00 3. 33 1.
22-06-2025 9 3. 67 2. 33 1.
23-06-2025 8 3. 00 1. 67 1.
24-06-2025 7 1. 33 2. 00 2.
25-06-2025 15 1. 67 1. 33 2.
26-06-2025 26 4. 00 3. 33 3.
27-06-2025 21 5. 33 4. 00 4.
28-06-2025 9 1. 67 2. 33 3.
29-06-2025 8 2. 00 2. 00 2.
30-06-2025 11 2. 33 2. 00 2.
01-07-2025 7 3. 33 2. 33 1.
02-07-2025 - 1. 00 - 1. 00 - 1.

Middle Latitude

Date A K-indices
03-06-2025 32 4 5 6 4 4 2 2
04-06-2025 17 1 3 3 3 4 4 3 3
05-06-2025 15 4 3 3 3 3 2 3 2
06-06-2025 8 2 2 2 2 3 2 2 2
07-06-2025 15 2 2 3 4 3 2 4 3
08-06-2025 13 2 2 2 2 3 3 3 4
09-06-2025 13 3 4 2 2 3 3 2 2
10-06-2025 11 2 2 3 2 3 2 3 3
11-06-2025 13 3 3 1 2 2 3 3 4
12-06-2025 24 4 4 4 4 3 3 4 4
13-06-2025 31 4 5 4 4 4 3 4 5
14-06-2025 21 5 4 3 3 4 2 3 3
15-06-2025 10 2 1 2 3 2 3 3 2
16-06-2025 10 1 2 4 2 3 2 2 2
17-06-2025 9 1 1 3 2 3 2 2 3
18-06-2025 12 3 2 2 3 2 2 2 4
19-06-2025 11 3 2 2 1 2 2 4 3
20-06-2025 8 1 2 3 2 2 3 1 1
21-06-2025 10 1 3 1 2 3 3 1 3
22-06-2025 9 3 3 1 2 2 2 2 2
23-06-2025 9 3 1 1 3 3 2 2 2
24-06-2025 9 1 2 3 3 2 2 2 2
25-06-2025 16 2 1 2 2 3 3 4 5
26-06-2025 24 4 3 3 3 3 4 4 5
27-06-2025 16 4 4 4 2 3 2 2 2
28-06-2025 8 1 2 3 2 2 2 2 2
29-06-2025 9 2 2 2 3 3 1 2 2
30-06-2025 11 2 3 2 4 2 2 2 2
01-07-2025 7 3 2 1 2 1 2 2 2
02-07-2025

High Latitude

Date A K-indices
03-06-2025 60 5 7 5 6 6 3 2
04-06-2025 37 1 4 3 5 6 6 4 3
05-06-2025 16 3 3 3 5 3 2 2 2
06-06-2025 22 3 3 6 5 2 2 2 0
07-06-2025 18 2 3 4 4 4 3 3 2
08-06-2025 18 2 2 1 1 5 5 3 3
09-06-2025 19 4 4 4 4 3 3 2 2
10-06-2025 10 3 2 3 3 2 2 2 2
11-06-2025 22 3 3 2 2 4 4 5 4
12-06-2025 44 4 5 5 6 6 4 3 4
13-06-2025 65 5 5 5 6 6 5 7 4
14-06-2025 27 5 5 4 4 3 4 3 2
15-06-2025 23 1 2 2 6 5 4 2 2
16-06-2025 16 2 4 4 3 4 2 2 2
17-06-2025 14 2 3 2 3 4 3 2 3
18-06-2025 20 3 3 4 4 5 3 2 2
19-06-2025 8 3 2 2 1 1 1 3 2
20-06-2025 13 1 2 4 3 4 3 2 1
21-06-2025 22 2 3 1 2 5 6 2 2
22-06-2025 14 3 3 2 4 4 2 2 2
23-06-2025 10 3 2 2 4 2 2 1 1
24-06-2025 7 1 2 2 3 2 2 1 1
25-06-2025 19 2 2 3 4 5 3 3 3
26-06-2025 41 4 4 3 5 6 6 4 4
27-06-2025 37 5 5 5 6 5 3 1 1
28-06-2025 20 2 2 5 5 4 2 2 2
29-06-2025 13 2 2 4 2 4 3 2 2
30-06-2025 27 4 3 3 6 2 5 3 2
01-07-2025 9 4 3 2 2 2 1 1 1
02-07-2025

About

The K-index quantifies disturbances in the horizontal component of earth's magnetic field with an integer in the range 0–9 with 1 being calm and 5 or more indicating a geomagnetic storm. It is derived from the maximum fluctuations of horizontal components observed on a magnetometer during a three-hour interval. The label K comes from the German word Kennziffer meaning “characteristic digit”. The K-index was introduced by Julius Bartels in 1938.

The Estimated 3-hour Planetary Kp-index is derived at the NOAA Space Weather Prediction Center using data from the following ground-based magnetometers:

  • Sitka, Alaska
  • Meanook, Canada
  • Ottawa, Canada
  • Fredericksburg, Virginia
  • Hartland, UK
  • Wingst, Germany
  • Niemegk, Germany
  • Canberra, Australia

These data are made available thanks to the cooperative efforts between SWPC and data providers around the world, which currently includes the U.S. Geological Survey, Natural Resources Canada (NRCAN), the British Geological Survey, the German Research Centre for Geosciences (GFZ), and Geoscience Australia. Important magnetometer observations are also contributed by the Institut de Physique du Globe de Paris and the Korean Space Weather Center K-index Watches are issued when the highest predicted NOAA estimated Kp-indices for a day are K = 5, 6, 7, or >= 8 and is reported in terms of the NOAA G scale. K-index Warnings are issued when NOAA estimated Kp-indices of 4, 5, 6, and 7 or greater are expected. K-index Alerts are issued when the NOAA estimated Kp-indices reach 4, 5, 6, 7, 8, or 9.


More info
Source de données: NOAA, Wikipedia

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