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EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 18.03.2025 05.56 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4876
Valid From: 2025 Mar 17 0345 UTC
Now Valid Until: 2025 Mar 18 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 4
Issued: 17.03.2025 21.02 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 17 2059 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 17.03.2025 20.54 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4875
Valid From: 2025 Mar 17 0345 UTC
Now Valid Until: 2025 Mar 18 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: 17.03.2025 14.48 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4874
Valid From: 2025 Mar 17 0345 UTC
Now Valid Until: 2025 Mar 17 2100 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: 17.03.2025 05.21 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3436
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 5055 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WARNING
Geomagnetic K-index of 4 expected
Publié: 17.03.2025 03.48 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 17 0345 UTC
Valid To: 2025 Mar 17 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.

WARNING
Geomagnetic K-index of 4 expected
Publié: 16.03.2025 14.48 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 16 1447 UTC
Valid To: 2025 Mar 17 0300 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: 16.03.2025 07.37 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3435
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 4951 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: 15.03.2025 05.00 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3434
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 3982 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: 15.03.2025 01.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4871
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 15 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 15.03.2025 01.42 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3433
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 3982 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: 14.03.2025 17.34 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4870
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 15 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 14.03.2025 10.45 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3432
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 1561 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 6
Publié: 14.03.2025 01.41 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Mar 14 0142 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.

WARNING
Geomagnetic K-Index of 6 expected
Publié: 14.03.2025 01.40 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Mar 14 0140 UTC
Valid To: 2025 Mar 14 1200 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 5 expected
Publié: 14.03.2025 01.30 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1992
Valid From: 2025 Mar 13 1930 UTC
Now Valid Until: 2025 Mar 14 1500 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: 14.03.2025 01.29 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4869
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 14.03.2025 01.27 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3431
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 1561 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 5
Publié: 14.03.2025 01.25 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 14 0120 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: 13.03.2025 19.50 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 1944 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: 13.03.2025 19.34 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 13 1930 UTC
Valid To: 2025 Mar 14 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: 13.03.2025 19.00 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4868
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 14 0300 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: 13.03.2025 14.18 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4867
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 13 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.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 13.03.2025 14.18 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1990
Valid From: 2025 Mar 12 1050 UTC
Now Valid Until: 2025 Mar 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 13.03.2025 13.24 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3430
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 1994 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 5
Publié: 13.03.2025 12.48 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 1248 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: 13.03.2025 12.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 1159 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 5
Publié: 13.03.2025 08.40 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 0839 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 5 expected
Publié: 13.03.2025 05.55 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1989
Valid From: 2025 Mar 12 1050 UTC
Now Valid Until: 2025 Mar 13 1500 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: 13.03.2025 05.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4866
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 13 1500 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: 13.03.2025 04.35 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 0435 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: 13.03.2025 01.32 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 0131 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: 12.03.2025 23.53 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 12 2353 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: 12.03.2025 23.02 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1988
Valid From: 2025 Mar 12 1050 UTC
Now Valid Until: 2025 Mar 13 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: 12.03.2025 20.55 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 12 2051 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 12.03.2025 17.52 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4865
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 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 5 expected
Publié: 12.03.2025 17.51 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1987
Valid From: 2025 Mar 12 1050 UTC
Now Valid Until: 2025 Mar 13 0000 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: 12.03.2025 17.49 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 12 1742 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 4
Publié: 12.03.2025 11.16 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 12 1030 UTC
Synoptic Period: 0900-1200 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 5 expected
Publié: 12.03.2025 10.50 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 12 1050 UTC
Valid To: 2025 Mar 12 1800 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
Type II Radio Emission
Publié: 12.03.2025 07.47 UTC
Type II Radio Emission
Begin Time: 2025 Mar 12 0503 UTC
Estimated Velocity: 403 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: 12.03.2025 07.35 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 12 0735 UTC
Valid To: 2025 Mar 12 2100 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: 12.03.2025 07.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3429
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 4110 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 4
Publié: 12.03.2025 02.37 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 12 0236 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: 12.03.2025 00.07 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 12 0006 UTC
Valid To: 2025 Mar 12 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 11.03.2025 09.22 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3428
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 2397 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 10.03.2025 12.07 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Mar 10 1150 UTC
Station: GOES16

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

CANCEL WARNING
Geomagnetic K-Index of 6 expected
Publié: 09.03.2025 23.20 UTC
Geomagnetic K-Index of 6 expected
Cancel Serial Number: 564
Original Issue Time: 2025 Mar 09 0423 UTC

Comment: The previous extention was an error. The conditions for this level of geomagnetic activity no longer exist.

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: 09.03.2025 23.19 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4862
Valid From: 2025 Mar 08 1500 UTC
Now Valid Until: 2025 Mar 10 0600 UTC
Warning Condition: Persisence

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: 09.03.2025 23.18 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 563
Valid From: 2025 Mar 09 0422 UTC
Now Valid Until: 2025 Mar 10 0600 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.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Publié: 09.03.2025 10.40 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 562
Valid From: 2025 Mar 09 0422 UTC
Now Valid Until: 2025 Mar 09 1800 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: 09.03.2025 10.40 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Mar 09 1040 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: 09.03.2025 09.32 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 09 0931 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: 09.03.2025 05.59 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Mar 09 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.

WARNING
Geomagnetic K-Index of 6 expected
Publié: 09.03.2025 04.23 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Mar 09 0422 UTC
Valid To: 2025 Mar 09 1200 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 5 expected
Publié: 09.03.2025 04.23 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1985
Valid From: 2025 Mar 08 2019 UTC
Now Valid Until: 2025 Mar 09 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 4 expected
Publié: 09.03.2025 04.23 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4861
Valid From: 2025 Mar 08 1500 UTC
Now Valid Until: 2025 Mar 09 2359 UTC
Warning Condition: Persisence

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: 09.03.2025 04.06 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 09 0405 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: 09.03.2025 02.57 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 09 0255 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: 08.03.2025 23.15 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 08 2310 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.

ALERT
Geomagnetic K-index of 5
Publié: 08.03.2025 21.03 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 08 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: 08.03.2025 20.20 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 08 2019 UTC
Valid To: 2025 Mar 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.

WARNING
Geomagnetic K-index of 4 expected
Publié: 08.03.2025 14.56 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 08 1500 UTC
Valid To: 2025 Mar 09 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: 08.03.2025 09.01 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 08 0859 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: 08.03.2025 06.58 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 08 0700 UTC
Valid To: 2025 Mar 08 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.

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 07.03.2025 19.12 UTC
Geomagnetic Storm Category G1 Predicted

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

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 07.03.2025 02.56 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 07: None (Below G1) Mar 08: None (Below G1) Mar 09: 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: 05.03.2025 11.54 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4858
Valid From: 2025 Mar 04 2132 UTC
Now Valid Until: 2025 Mar 05 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.

WARNING
Geomagnetic K-index of 5 expected
Publié: 04.03.2025 21.39 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 04 2139 UTC
Valid To: 2025 Mar 05 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.

ALERT
Geomagnetic K-index of 4
Publié: 04.03.2025 21.36 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 04 2127 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: 04.03.2025 21.33 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 04 2132 UTC
Valid To: 2025 Mar 05 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: 04.03.2025 18.44 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3426
Begin Time: 2025 Mar 02 1510 UTC
Yesterday Maximum 2MeV Flux: 1134 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 02.03.2025 15.48 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Mar 02 1510 UTC
Station: GOES-16

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

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 02.03.2025 05.22 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 03: None (Below G1) Mar 04: G1 (Minor) Mar 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 4 expected
Publié: 01.03.2025 21.11 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4856
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Mar 02 1200 UTC
Warning Condition: Persistence

Comment: Correction for valid time date from 01 Mar to 02 Mar.

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: 01.03.2025 20.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4855
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Mar 01 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.

ALERT
Geomagnetic K-index of 5
Publié: 28.02.2025 17.57 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 28 1757 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
Type II Radio Emission
Publié: 28.02.2025 17.18 UTC
Type II Radio Emission
Begin Time: 2025 Feb 28 1700 UTC
Estimated Velocity: 1151 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
Geomagnetic K-index of 5
Publié: 28.02.2025 15.00 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 28 1459 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 5 expected
Publié: 28.02.2025 14.19 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1982
Valid From: 2025 Feb 27 1052 UTC
Now Valid Until: 2025 Mar 01 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: 28.02.2025 14.17 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4854
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Mar 01 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.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 28.02.2025 05.54 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1981
Valid From: 2025 Feb 27 1052 UTC
Now Valid Until: 2025 Feb 28 1500 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: 28.02.2025 02.17 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 28 0215 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.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 27.02.2025 23.56 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1980
Valid From: 2025 Feb 27 1052 UTC
Now Valid Until: 2025 Feb 28 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: 27.02.2025 18.02 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 27 1759 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 27.02.2025 17.42 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4853
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Feb 28 1500 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: 27.02.2025 17.38 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1979
Valid From: 2025 Feb 27 1052 UTC
Now Valid Until: 2025 Feb 27 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.

ALERT
Geomagnetic K-index of 6
Publié: 27.02.2025 11.14 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Feb 27 1110 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.

WARNING
Geomagnetic K-Index of 6 expected
Publié: 27.02.2025 11.09 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Feb 27 1108 UTC
Valid To: 2025 Feb 27 1500 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: 27.02.2025 10.57 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 27 1052 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.

WARNING
Geomagnetic K-index of 5 expected
Publié: 27.02.2025 10.53 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Feb 27 1052 UTC
Valid To: 2025 Feb 27 1800 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: 27.02.2025 10.47 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4852
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Feb 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 4
Publié: 27.02.2025 02.22 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 27 0222 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: 27.02.2025 01.01 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 27 0101 UTC
Valid To: 2025 Feb 27 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 26.02.2025 14.54 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4850
Valid From: 2025 Feb 26 0431 UTC
Now Valid Until: 2025 Feb 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.

SUMMARY
Proton Event 10MeV Integral Flux exceeded 10pfu
Publié: 26.02.2025 12.03 UTC
Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Feb 25 0020 UTC
Maximum Time: 2025 Feb 25 0240 UTC
End Time: 2025 Feb 25 1115 UTC
Maximum 10MeV Flux: 37 pfu
NOAA Scale: S1 - Minor

ALERT
Geomagnetic K-index of 4
Publié: 26.02.2025 06.02 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 26 0553 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: 26.02.2025 04.32 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 26 0431 UTC
Valid To: 2025 Feb 26 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.

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Publié: 25.02.2025 23.43 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 595
Valid From: 2025 Feb 24 2338 UTC
Now Valid Until: 2025 Feb 26 1200 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

WARNING
Geomagnetic K-index of 4 expected
Publié: 25.02.2025 23.26 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 25 2325 UTC
Valid To: 2025 Feb 26 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
Proton 10MeV Integral Flux above 10pfu expected
Publié: 25.02.2025 14.47 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 594
Valid From: 2025 Feb 24 2338 UTC
Now Valid Until: 2025 Feb 25 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

SUMMARY
10cm Radio Burst
Publié: 25.02.2025 12.32 UTC
10cm Radio Burst
Begin Time: 2025 Feb 25 1136 UTC
Maximum Time: 2025 Feb 25 1137 UTC
End Time: 2025 Feb 25 1149 UTC
Duration: 13 minutes
Peak Flux: 230 sfu
Latest Penticton Noon Flux: 203 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
Type IV Radio Emission
Publié: 25.02.2025 12.31 UTC
Type IV Radio Emission
Begin Time: 2025 Feb 25 1139 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: 25.02.2025 12.31 UTC
Type II Radio Emission
Begin Time: 2025 Feb 25 1145 UTC
Estimated Velocity: 630 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.

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Publié: 25.02.2025 11.49 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 593
Valid From: 2025 Feb 24 2338 UTC
Now Valid Until: 2025 Feb 25 2100 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

ALERT
Proton Event 10MeV Integral Flux exceeded 10pfu
Publié: 25.02.2025 00.28 UTC
Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Feb 25 0020 UTC
NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 24.02.2025 23.57 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4847
Valid From: 2025 Feb 24 1325 UTC
Now Valid Until: 2025 Feb 25 1500 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
Proton 10MeV Integral Flux above 10pfu expected
Publié: 24.02.2025 23.38 UTC
Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2025 Feb 24 2338 UTC
Valid To: 2025 Feb 25 1200 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

ALERT
Type IV Radio Emission
Publié: 24.02.2025 22.42 UTC
Type IV Radio Emission
Begin Time: 2025 Feb 24 2220 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: 24.02.2025 22.31 UTC
Type II Radio Emission
Begin Time: 2025 Feb 24 2209 UTC
Estimated Velocity: 641 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 5 expected
Publié: 24.02.2025 20.10 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Feb 24 2010 UTC
Valid To: 2025 Feb 24 2359 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: 24.02.2025 20.04 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 24 1958 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: 24.02.2025 13.25 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 24 1325 UTC
Valid To: 2025 Feb 24 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: 24.02.2025 07.22 UTC
Type II Radio Emission
Begin Time: 2025 Feb 24 0703 UTC
Estimated Velocity: 588 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: 24.02.2025 02.22 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 24 0222 UTC
Valid To: 2025 Feb 24 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.

SUMMARY
X-ray Event exceeded X1
Publié: 23.02.2025 20.14 UTC
X-ray Event exceeded X1
Begin Time: 2025 Feb 23 1922 UTC
Maximum Time: 2025 Feb 23 1927 UTC
End Time: 2025 Feb 23 1934 UTC
X-ray Class: X2.0
Location: N26W90
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: 23.02.2025 19.31 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2025 Feb 23 1925 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.

SUMMARY
10cm Radio Burst
Publié: 20.02.2025 09.09 UTC
10cm Radio Burst
Begin Time: 2025 Feb 20 0444 UTC
Maximum Time: 2025 Feb 20 0444 UTC
End Time: 2025 Feb 20 0445 UTC
Duration: 1 minutes
Peak Flux: 200 sfu
Latest Penticton Noon Flux: 178 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
Type II Radio Emission
Publié: 20.02.2025 08.37 UTC
Type II Radio Emission
Begin Time: 2025 Feb 19 2338 UTC
Estimated Velocity: 553 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
Geomagnetic K-index of 4
Publié: 19.02.2025 20.58 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 19 2055 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: 19.02.2025 20.25 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 19 2024 UTC
Valid To: 2025 Feb 20 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.

WARNING
Geomagnetic K-index of 5 expected
Publié: 19.02.2025 08.04 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Feb 19 0804 UTC
Valid To: 2025 Feb 19 1500 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: 19.02.2025 07.37 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4843
Valid From: 2025 Feb 18 2234 UTC
Now Valid Until: 2025 Feb 19 1500 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: 19.02.2025 01.49 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 19 0149 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: 19.02.2025 00.02 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 18 2359 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: 18.02.2025 22.43 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Feb 18 2242 UTC
Valid To: 2025 Feb 19 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.

ALERT
Geomagnetic K-index of 4
Publié: 18.02.2025 22.36 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 18 2236 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: 18.02.2025 22.35 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 18 2234 UTC
Valid To: 2025 Feb 19 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 18.02.2025 08.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4841
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 18 1500 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: 17.02.2025 23.47 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4840
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 18 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 4 expected
Publié: 17.02.2025 11.24 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4839
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 17 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: 17.02.2025 04.44 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4838
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 17 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: 17.02.2025 03.47 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3424
Begin Time: 2025 Feb 11 1405 UTC
Yesterday Maximum 2MeV Flux: 3934 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: 16.02.2025 20.20 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4837
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 17 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: 16.02.2025 14.22 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4836
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 16 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.

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
16-02-2025 185 271 1270 2 * 9 0 0 1 0 0 0
17-02-2025 185 218 1550 0 * 17 1 0 9 0 0 0
18-02-2025 178 187 1465 0 * 11 0 0 0 0 0 0
19-02-2025 178 119 1315 0 * 6 0 0 1 0 0 0
20-02-2025 184 123 1335 0 * 6 0 0 0 0 0 0
21-02-2025 197 138 1240 1 * 6 2 0 11 2 0 0
22-02-2025 199 215 1230 6 * 15 0 0 11 0 0 0
23-02-2025 210 186 1150 0 * 7 4 1 7 0 0 0
24-02-2025 203 182 1410 1 * 4 4 0 1 1 0 0
25-02-2025 190 155 1290 1 * 2 2 0 6 1 0 0
26-02-2025 180 123 1000 0 * 6 0 0 1 0 0 0
27-02-2025 164 129 830 0 * 4 0 0 0 0 0 0
28-02-2025 157 104 290 2 * 9 0 0 4 0 0 0
01-03-2025 152 105 410 0 * 7 0 0 2 0 0 0
02-03-2025 151 139 520 3 * 9 0 0 2 0 0 0
03-03-2025 163 99 660 1 * 7 0 0 3 0 0 0
04-03-2025 161 134 560 2 * 12 0 0 2 0 0 0
05-03-2025 157 147 730 2 * 5 1 0 1 0 0 0
06-03-2025 150 139 720 0 * 3 0 0 0 0 0 0
07-03-2025 147 109 480 1 * 4 1 0 1 0 0 0
08-03-2025 148 90 450 0 * 7 0 0 1 0 0 0
09-03-2025 148 73 450 1 * 3 0 0 0 0 0 0
10-03-2025 149 74 500 1 * 5 0 0 0 0 0 0
11-03-2025 161 128 610 3 * 4 1 0 5 0 0 0
12-03-2025 160 160 640 3 * 21 0 0 3 0 0 0
13-03-2025 175 160 690 0 * 12 0 0 1 1 0 0
14-03-2025 180 147 520 0 * 9 1 0 0 0 0 0
15-03-2025 178 185 870 5 * 8 0 0 1 0 0 0
16-03-2025 186 190 750 1 * 9 0 0 8 0 0 0
17-03-2025 204 189 620 0 * 11 1 0 4 3 0 0
Moyenne/Total 173 147 852 36 238 18 1 86 8 0 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
UTC
3h
UTC
6h
UTC
9h
UTC
12h
UTC
15h
UTC
18h
UTC
21h
UTC
3. 33 3. 33 - 1.



Data


Estimated Planetary

Estimated Planetary

Date A K-indices (UTC)
0h 3h 6h 9h 12h 15h 18h 21h
17-02-2025 15 3. 00 3. 33 2.
18-02-2025 14 3. 67 3. 33 2.
19-02-2025 20 5. 00 3. 33 4.
20-02-2025 7 3. 67 2. 67 1.
21-02-2025 6 3. 00 0. 67 1.
22-02-2025 7 3. 00 0. 67 0.
23-02-2025 7 3. 00 1. 67 1.
24-02-2025 14 3. 33 1. 33 1.
25-02-2025 9 1. 67 2. 00 1.
26-02-2025 16 3. 00 3. 67 3.
27-02-2025 33 4. 00 4. 33 3.
28-02-2025 32 5. 00 4. 00 4.
01-03-2025 19 2. 33 4. 00 4.
02-03-2025 6 2. 00 1. 67 2.
03-03-2025 5 1. 67 1. 00 1.
04-03-2025 11 1. 67 2. 33 1.
05-03-2025 13 3. 67 3. 33 2.
06-03-2025 7 2. 33 1. 67 2.
07-03-2025 11 1. 00 2. 67 2.
08-03-2025 21 2. 33 3. 00 3.
09-03-2025 35 4. 67 5. 67 4.
10-03-2025 10 3. 00 2. 00 2.
11-03-2025 10 2. 33 2. 33 2.
12-03-2025 32 3. 67 3. 67 3.
13-03-2025 42 5. 00 5. 00 5.
14-03-2025 25 5. 67 3. 33 3.
15-03-2025 18 4. 00 3. 67 3.
16-03-2025 11 2. 00 2. 33 2.
17-03-2025 16 3. 33 3. 33 3.
18-03-2025 16 3. 33 3. 33 - 1.

Middle Latitude

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

High Latitude

Date A K-indices
17-02-2025 20 2 2 2 4 5 5 2 2
18-02-2025 12 3 4 2 0 1 3 3 3
19-02-2025 19 4 3 5 3 2 2 3 3
20-02-2025 4 3 2 1 1 0 0 0 0
21-02-2025 3 1 0 1 1 3 0 0 0
22-02-2025 5 2 0 1 3 3 0 1 0
23-02-2025 2 1 1 1 2 0 0 0 1
24-02-2025 17 1 0 0 5 4 3 4 3
25-02-2025 11 3 2
26-02-2025 33 1 4 3 6 4 5 5 3
27-02-2025 54 3 5 4 7 6 6 4 3
28-02-2025 51 4 4 5 6 6 6 5 3
01-03-2025 41 2 4 7 6 5 2 3 2
02-03-2025 5 2 1 2 3 2 0 0 0
03-03-2025 2 1 0 0 2 0 1 1 1
04-03-2025 7 0 1 0 2 2 1 2 4
05-03-2025 21 3 3 5 4 4 4 2 1
06-03-2025 5 2 1 2 2 0 1 2 1
07-03-2025 18 1 1 3 5 3 5 3 0
08-03-2025 25 1 3 5 5 3 3 4 4
09-03-2025 49 4 5 4 7 6 5 2 3
10-03-2025 18 3 2 4 5 4 3 1 1
11-03-2025 13 1 2 3 4 4 3 1 1
12-03-2025 51 3 4 4 6 6 6 6 3
13-03-2025 44 4 4 6 5 6 4 5 3
14-03-2025 29 5 4 4 4 4 5 3 3
15-03-2025 29 3 2 5 6 4 5 1 1
16-03-2025 21 2 2 3 5 6 2 1 1
17-03-2025 23 3 3 4 3 5 5 2 2
18-03-2025 2 4

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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