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EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 18.04.2021 07.10 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3882
Valid From: 2021 Apr 17 2330 UTC
Now Valid Until: 2021 Apr 18 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
Issued: 18.04.2021 05.04 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3131
Begin Time: 2021 Apr 17 1715 UTC
Yesterday Maximum 2MeV Flux: 1252 pfu

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

ALERT
Geomagnetic K-index of 4
Issued: 17.04.2021 23.44 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Apr 17 2344 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: 17.04.2021 23.33 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Apr 17 2330 UTC
Valid To: 2021 Apr 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.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 17.04.2021 17.31 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2021 Apr 17 1715 UTC
Station: GOES-16


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

ALERT
Type II Radio Emission
Publié: 17.04.2021 17.26 UTC
Type II Radio Emission
Begin Time: 2021 Apr 17 1626 UTC
Estimated Velocity: 353 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 6 expected
Publié: 17.04.2021 08.13 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2021 Apr 17 0812 UTC
Valid To: 2021 Apr 17 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.

ALERT
Geomagnetic K-index of 5
Publié: 17.04.2021 07.53 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Apr 17 0746 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: 17.04.2021 06.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Apr 17 0559 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.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 17.04.2021 05.33 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1593
Valid From: 2021 Apr 16 1925 UTC
Now Valid Until: 2021 Apr 17 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: 17.04.2021 05.33 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3880
Valid From: 2021 Apr 16 1335 UTC
Now Valid Until: 2021 Apr 17 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 5
Publié: 17.04.2021 02.02 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Apr 17 0200 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: 16.04.2021 20.27 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Apr 16 2025 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: 16.04.2021 19.23 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Apr 16 1925 UTC
Valid To: 2021 Apr 17 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: 16.04.2021 19.23 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3878
Valid From: 2021 Apr 16 1335 UTC
Now Valid Until: 2021 Apr 17 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 4
Publié: 16.04.2021 18.40 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Apr 16 1838 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: 16.04.2021 13.34 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Apr 16 1335 UTC
Valid To: 2021 Apr 16 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.

ALERT
Geomagnetic K-index of 5
Publié: 15.04.2021 09.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Apr 15 0859 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.

WARNING
Geomagnetic K-index of 5 expected
Publié: 15.04.2021 07.12 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Apr 15 0712 UTC
Valid To: 2021 Apr 15 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: 15.04.2021 05.48 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3876
Valid From: 2021 Apr 14 2342 UTC
Now Valid Until: 2021 Apr 15 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 4
Publié: 14.04.2021 23.58 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Apr 14 2358 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: 14.04.2021 23.43 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Apr 14 2342 UTC
Valid To: 2021 Apr 15 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: 14.04.2021 19.40 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 15: None (Below G1) Apr 16: None (Below G1) Apr 17: 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: 08.04.2021 02.48 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3874
Valid From: 2021 Apr 07 0930 UTC
Now Valid Until: 2021 Apr 08 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: 07.04.2021 20.46 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3873
Valid From: 2021 Apr 07 0930 UTC
Now Valid Until: 2021 Apr 08 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.

ALERT
Geomagnetic K-index of 5
Publié: 07.04.2021 18.00 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Apr 07 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.

WARNING
Geomagnetic K-index of 5 expected
Publié: 07.04.2021 16.26 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Apr 07 1626 UTC
Valid To: 2021 Apr 07 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: 07.04.2021 14.39 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3872
Valid From: 2021 Apr 07 0930 UTC
Now Valid Until: 2021 Apr 07 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: 07.04.2021 10.29 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Apr 07 1029 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 4 expected
Publié: 07.04.2021 09.29 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Apr 07 0930 UTC
Valid To: 2021 Apr 07 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
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 02.04.2021 17.41 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2021 Apr 02 1715 UTC
Station: GOES-16


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

WARNING
Geomagnetic K-index of 4 expected
Publié: 01.04.2021 01.18 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Apr 01 0118 UTC
Valid To: 2021 Apr 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.

CANCEL WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 29.03.2021 10.53 UTC
Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 892
Original Issue Time: 2021 Mar 26 2155 UTC

Comment: G1 (Minor) geomagnetic storm conditions are no longer warranted under the currently forecasted solar wind regime.

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: 27.03.2021 23.51 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Mar 27 2351 UTC
Valid To: 2021 Mar 28 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: 27.03.2021 23.49 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Mar 27 2349 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: 27.03.2021 23.48 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Mar 27 2348 UTC
Valid To: 2021 Mar 28 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: 26.03.2021 21.55 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 27: None (Below G1) Mar 28: G1 (Minor) Mar 29: 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: 26.03.2021 14.42 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3128
Begin Time: 2021 Mar 22 0820 UTC
Yesterday Maximum 2MeV Flux: 1205 pfu

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

ALERT
Geomagnetic K-index of 4
Publié: 26.03.2021 01.51 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Mar 26 0151 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: 26.03.2021 01.49 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Mar 26 0149 UTC
Valid To: 2021 Mar 26 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
Publié: 25.03.2021 22.11 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 26: None (Below G1) Mar 27: None (Below G1) Mar 28: 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: 25.03.2021 14.04 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3127
Begin Time: 2021 Mar 22 0820 UTC
Yesterday Maximum 2MeV Flux: 5102 pfu

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

WARNING
Geomagnetic K-index of 4 expected
Publié: 25.03.2021 13.43 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Mar 25 1342 UTC
Valid To: 2021 Mar 25 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
Geomagnetic K-index of 5
Publié: 25.03.2021 01.57 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Mar 25 0157 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 5 expected
Publié: 25.03.2021 00.53 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Mar 25 0053 UTC
Valid To: 2021 Mar 25 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: 25.03.2021 00.48 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Mar 25 0048 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: 25.03.2021 00.36 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Mar 25 0036 UTC
Valid To: 2021 Mar 25 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
Geomagnetic Sudden Impulse
Publié: 24.03.2021 20.40 UTC
Geomagnetic Sudden Impulse
Observed: 2021 Mar 24 2016 UTC
Deviation: 17 nT
Station: NGK

WARNING
Geomagnetic Sudden Impulse expected
Publié: 24.03.2021 19.54 UTC
Geomagnetic Sudden Impulse expected
Valid From: 2021 Mar 24 2000 UTC
Valid To: 2021 Mar 24 2100 UTC
IP Shock Passage Observed: 2021 Mar 24 1920 UTC

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 24.03.2021 06.50 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3126
Begin Time: 2021 Mar 22 0820 UTC
Yesterday Maximum 2MeV Flux: 10084 pfu

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

ALERT
Geomagnetic K-index of 4
Publié: 23.03.2021 06.04 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Mar 23 0600 UTC
Synoptic Period: 0300-0600 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: 23.03.2021 05.53 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Mar 23 0555 UTC
Valid To: 2021 Mar 23 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 23.03.2021 05.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3125
Begin Time: 2021 Mar 22 0820 UTC
Yesterday Maximum 2MeV Flux: 4050 pfu

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

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 22.03.2021 08.45 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2021 Mar 22 0820 UTC
Station: GOES-16


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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 22.03.2021 05.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3864
Valid From: 2021 Mar 21 1415 UTC
Now Valid Until: 2021 Mar 22 1300 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: 21.03.2021 21.02 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Mar 21 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.

ALERT
Geomagnetic K-index of 5
Publié: 21.03.2021 18.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Mar 21 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.

WARNING
Geomagnetic K-index of 5 expected
Publié: 21.03.2021 16.33 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Mar 21 1630 UTC
Valid To: 2021 Mar 21 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: 21.03.2021 14.23 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Mar 21 1423 UTC
Synoptic Period: 1200-1500 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: 21.03.2021 14.18 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Mar 21 1415 UTC
Valid To: 2021 Mar 22 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
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 21.03.2021 13.14 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2021 Mar 21 1255 UTC
Station: GOES16


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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 21.03.2021 05.43 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3862
Valid From: 2021 Mar 20 0250 UTC
Now Valid Until: 2021 Mar 21 1300 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: 20.03.2021 14.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3861
Valid From: 2021 Mar 20 0250 UTC
Now Valid Until: 2021 Mar 21 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
Geomagnetic K-index of 5
Publié: 20.03.2021 11.04 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Mar 20 1104 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: 20.03.2021 08.03 UTC
Geomagnetic K-index of 6
Threshold Reached: 2021 Mar 20 0800 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.

WARNING
Geomagnetic K-Index of 6 expected
Publié: 20.03.2021 07.21 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2021 Mar 20 0720 UTC
Valid To: 2021 Mar 20 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.

ALERT
Geomagnetic K-index of 5
Publié: 20.03.2021 07.12 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Mar 20 0710 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.

WARNING
Geomagnetic K-index of 5 expected
Publié: 20.03.2021 06.47 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Mar 20 0645 UTC
Valid To: 2021 Mar 20 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.

ALERT
Geomagnetic K-index of 4
Publié: 20.03.2021 06.46 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Mar 20 0645 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: 20.03.2021 02.50 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Mar 20 0250 UTC
Valid To: 2021 Mar 20 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: 19.03.2021 17.06 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 20: G1 (Minor) Mar 21: G1 (Minor) Mar 22: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: G1 (Minor) Watch issued for likely high speed stream effects originating from a large, negative polarity coronal hole.

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: 19.03.2021 15.27 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3122
Begin Time: 2021 Mar 14 1520 UTC
Yesterday Maximum 2MeV Flux: 1501 pfu

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

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
19-03-2021 74 14 30 0 * 0 0 0 0 0 0 0
20-03-2021 80 12 10 0 * 0 0 0 0 0 0 0
21-03-2021 77 12 10 1 * 0 0 0 0 0 0 0
22-03-2021 80 23 40 1 * 0 0 0 2 0 0 0
23-03-2021 79 26 80 0 * 0 0 0 0 0 0 0
24-03-2021 84 26 40 0 * 0 0 0 0 0 0 0
25-03-2021 79 24 50 0 * 0 0 0 1 0 0 0
26-03-2021 80 24 40 0 * 0 0 0 0 0 0 0
27-03-2021 80 11 30 0 * 0 0 0 0 0 0 0
28-03-2021 75 11 10 0 * 0 0 0 0 0 0 0
29-03-2021 74 13 20 0 * 0 0 0 0 0 0 0
30-03-2021 80 0 0 0 * 0 0 0 1 0 0 0
31-03-2021 74 0 0 0 * 0 0 0 0 0 0 0
01-04-2021 78 0 0 0 * 0 0 0 0 0 0 0
02-04-2021 72 0 0 0 * 0 0 0 0 0 0 0
03-04-2021 73 12 20 0 * 0 0 0 0 0 0 0
04-04-2021 70 11 10 1 * 0 0 0 0 0 0 0
05-04-2021 72 11 5 0 * 0 0 0 0 0 0 0
06-04-2021 74 11 0 0 * 0 0 0 0 0 0 0
07-04-2021 76 0 0 0 * 0 0 0 0 0 0 0
08-04-2021 74 0 0 0 * 0 0 0 0 0 0 0
09-04-2021 78 0 0 0 * 0 0 0 0 0 0 0
10-04-2021 70 0 0 0 * 0 0 0 0 0 0 0
11-04-2021 73 0 0 0 * 0 0 0 0 0 0 0
12-04-2021 83 16 10 1 * 0 0 0 2 0 0 0
13-04-2021 73 16 30 0 * 0 0 0 0 0 0 0
14-04-2021 74 17 90 0 * 0 0 0 0 0 0 0
15-04-2021 72 22 50 0 * 0 0 0 0 0 0 0
16-04-2021 77 44 110 2 * 0 0 0 0 0 0 0
17-04-2021 75 28 30 0 * 0 0 0 0 0 0 0
Moyenne/Total 76 13 24 6 0 0 0 6 0 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



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Data


Estimated Planetary

Estimated Planetary

Date A K-indices (UTC)
0h 3h 6h 9h 12h 15h 18h 21h
20-03-2021 29 2 3 6 5 4 4 3 4
21-03-2021 24 4 4 1 2 4 5 5 3
22-03-2021 8 3 3 2 2 1 1 1 1
23-03-2021 11 3 4 2 2 2 2 2 3
24-03-2021 11 3 3 3 2 2 1 2 3
25-03-2021 18 5 4 4 2 3 1 1 3
26-03-2021 12 4 3 3 3 1 2 2 2
27-03-2021 9 1 1 1 1 0 1 3 4
28-03-2021 6 3 1 1 1 1 0 1 1
29-03-2021 4 1 2 1 1 1 1 1 1
30-03-2021 3 0 1 1 1 1 1 1 2
31-03-2021 10 3 3 2 3 2 3 2 3
01-04-2021 8 3 3 2 2 0 1 2 2
02-04-2021 6 2 1 1 1 1 3 2 1
03-04-2021 4 2 2 1 1 1 0 1 1
04-04-2021 3 1 0 1 0 1 1 0 1
05-04-2021 5 1 1 1 1 3 1 0 1
06-04-2021 3 0 0 0 0 1 0 1 1
07-04-2021 17 1 2 3 4 4 5 3 2
08-04-2021 5 1 1 0 2 2 1 2 1
09-04-2021 3 0 2 0 1 1 1 0 0
10-04-2021 5 1 1 1 1 1 2 1 2
11-04-2021 6 2 2 2 1 1 1 2 2
12-04-2021 5 1 1 1 2 1 2 1 0
13-04-2021 5 0 2 1 2 2 2 1 2
14-04-2021 7 1 1 1 2 1 1 2 4
15-04-2021 13 3 3 5 1 2 2 1 2
16-04-2021 19 2 3 3 3 3 3 5 4
17-04-2021 29 5 5 5 4 4 3 3 4
18-04-2021 20 4 4 3 3

Middle Latitude

Date A K-indices
20-03-2021 20 2 3 5 4 3 3 3 3
21-03-2021 17 4 3 1 2 4 3 4 3
22-03-2021 6 2 2 2 1 2 2 1 1
23-03-2021 9 2 3 2 1 2 2 2 3
24-03-2021 11 3 3 3 2 2 1 2 3
25-03-2021 18 5 4 4 2 3 2 1 2
26-03-2021 11 3 3 3 3 2 2 1 2
27-03-2021 7 0 1 0 1 1 2 3 4
28-03-2021 4 3 1 0 1 1 1 1 1
29-03-2021 3 1 2 1 1 1 1 1 0
30-03-2021 4 0 1 1 1 1 1 2 2
31-03-2021 7 1 2 2 1 2 3 1 2
01-04-2021 8 3 3 2 2 1 2 1 2
02-04-2021 4 1 1 1 0 1 2 2 2
03-04-2021 2 1 1 0 1 1 1 0 1
04-04-2021 2 1 0 1 0 1 1 0 0
05-04-2021 5 1 1 1 1 3 2 1 1
06-04-2021 3 0 1 0 0 1 0 2 2
07-04-2021 15 1 2 3 4 4 4 2 2
08-04-2021 3 0 1 0 1 2 1 2 1
09-04-2021 2 0 2 0 0 1 1 0 1
10-04-2021 3 0 0 0 1 2 2 1 2
11-04-2021 5 2 2 2 1 1 1 2 1
12-04-2021 4 1 0 1 2 2 2 1 0
13-04-2021 5 0 1 1 2 2 2 2 2
14-04-2021 7 1 1 1 2 2 2 2 3
15-04-2021 11 3 3 4 1 3 1 1 2
16-04-2021 15 2 3 3 2 3 3 4 3
17-04-2021 20 3 4 5 3 3 2 2 4
18-04-2021 3 3 3 3

High Latitude

Date A K-indices
20-03-2021 40 1 2 7 6 3 5 3 3
21-03-2021 45 3 3 2 2 7 7 4 2
22-03-2021 12 3 2 3 4 3 2 1 1
23-03-2021 11 2 3 3 3 3 3 1 1
24-03-2021 17 2 2 3 5 5 0 2 2
25-03-2021 26 3 4 5 3 6 3 2 1
26-03-2021 23 2 3 5 5 5 2 2 1
27-03-2021 4 0 0 1 1 0 1 2 3
28-03-2021 2 2 1 0 1 0 0 0 0
29-03-2021 1 0 0 1 1 0 0 0 0
30-03-2021 0 0 0 0 0 0 0 0 1
31-03-2021 15 1 2 4 4 4 3 2 1
01-04-2021 8 2 3 4 2 0 1 1 0
02-04-2021 7 1 1 0 2 2 4 2 0
03-04-2021 2 1 1 1 1 1 0 0 0
04-04-2021 1 0 0 1 1 1 0 0 0
05-04-2021 4 0 0 0 0 4 1 0 0
06-04-2021 0 0 0 0 0 0 0 1 0
07-04-2021 35 1 1 3 6 6 6 3 1
08-04-2021 4 1 0 0 3 2 0 1 0
09-04-2021 2 1 1 0 2 1 0 0 0
10-04-2021 4 0 0 1 2 2 3 1 0
11-04-2021 6 1 2 4 2 0 0 1 1
12-04-2021 5 1 1 2 3 1 1 1 0
13-04-2021 6 0 1 1 4 2 1 1 1
14-04-2021 2 1 1 0 1 1 0 1 1
15-04-2021 10 2 3 5 0 1 1 0 1
16-04-2021 31 2 2 4 4 6 4 5 4
17-04-2021 57 5 4 6 7 6 5 3 3
18-04-2021 3 3 5 7

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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