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CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: Mar 8, 2021 13.37 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3112
Begin Time: 2021 Mar 03 0745 UTC
Yesterday Maximum 2MeV Flux: 1420 pfu

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

ALERT
Geomagnetic K-index of 4
Issued: Mar 7, 2021 22.21 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Mar 07 2219 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
Issued: Mar 7, 2021 22.19 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Mar 07 2215 UTC
Valid To: 2021 Mar 08 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: Mar 7, 2021 17.09 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3111
Begin Time: 2021 Mar 03 0745 UTC
Yesterday Maximum 2MeV Flux: 1545 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: Mar 6, 2021 17.57 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3851
Valid From: 2021 Mar 06 0230 UTC
Now Valid Until: 2021 Mar 07 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: Mar 6, 2021 12.57 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3110
Begin Time: 2021 Mar 03 0745 UTC
Yesterday Maximum 2MeV Flux: 6209 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: Mar 6, 2021 03.08 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3850
Valid From: 2021 Mar 06 0230 UTC
Now Valid Until: 2021 Mar 06 1800 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: Mar 6, 2021 03.08 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Mar 06 0310 UTC
Valid To: 2021 Mar 06 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: Mar 6, 2021 02.58 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Mar 06 0257 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: Mar 6, 2021 02.28 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Mar 06 0230 UTC
Valid To: 2021 Mar 06 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: Mar 5, 2021 07.18 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3109
Begin Time: 2021 Mar 03 0745 UTC
Yesterday Maximum 2MeV Flux: 6727 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: Mar 4, 2021 05.54 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3848
Valid From: 2021 Mar 02 0830 UTC
Now Valid Until: 2021 Mar 04 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: Mar 4, 2021 05.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3108
Begin Time: 2021 Mar 03 0745 UTC
Yesterday Maximum 2MeV Flux: 4798 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: Mar 3, 2021 23.54 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3847
Valid From: 2021 Mar 02 0830 UTC
Now Valid Until: 2021 Mar 04 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.

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: Mar 3, 2021 21.07 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 04: None (Below G1) Mar 05: None (Below G1) Mar 06: 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: Mar 3, 2021 17.56 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3846
Valid From: 2021 Mar 02 0830 UTC
Now Valid Until: 2021 Mar 03 2359 UTC
Warning Condition: persistence

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

ALERT
Geomagnetic K-index of 5
Publié: Mar 3, 2021 09.00 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Mar 03 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.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: Mar 3, 2021 08.05 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2021 Mar 03 0745 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: Mar 3, 2021 05.03 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3845
Valid From: 2021 Mar 02 0830 UTC
Now Valid Until: 2021 Mar 03 1800 UTC
Warning Condition: persistence

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

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: Mar 3, 2021 05.03 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1581
Valid From: 2021 Mar 02 2035 UTC
Now Valid Until: 2021 Mar 03 1200 UTC
Warning Condition: Persistence

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

ALERT
Geomagnetic K-index of 5
Publié: Mar 3, 2021 05.03 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Mar 03 0500 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: Mar 3, 2021 03.03 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Mar 03 0300 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: Mar 2, 2021 20.46 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Mar 02 2046 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: Mar 2, 2021 20.39 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3844
Valid From: 2021 Mar 02 0830 UTC
Now Valid Until: 2021 Mar 03 1200 UTC
Warning Condition: persistence

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

WARNING
Geomagnetic K-index of 5 expected
Publié: Mar 2, 2021 20.35 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Mar 02 2035 UTC
Valid To: 2021 Mar 03 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: Mar 2, 2021 18.01 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Mar 02 1759 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: Mar 2, 2021 14.53 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3843
Valid From: 2021 Mar 02 0830 UTC
Now Valid Until: 2021 Mar 02 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.

WARNING
Geomagnetic K-index of 4 expected
Publié: Mar 2, 2021 08.27 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Mar 02 0830 UTC
Valid To: 2021 Mar 02 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
Geomagnetic K-index of 4 expected
Publié: Mar 1, 2021 10.30 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3841
Valid From: 2021 Mar 01 0300 UTC
Now Valid Until: 2021 Mar 02 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 5 expected
Publié: Mar 1, 2021 08.51 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1579
Valid From: 2021 Mar 01 0350 UTC
Now Valid Until: 2021 Mar 01 2100 UTC
Warning Condition: Onset

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: Mar 1, 2021 07.23 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Mar 01 0721 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 6
Publié: Mar 1, 2021 04.21 UTC
Geomagnetic K-index of 6
Threshold Reached: 2021 Mar 01 0420 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: Mar 1, 2021 04.11 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2021 Mar 01 0410 UTC
Valid To: 2021 Mar 01 0900 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: Mar 1, 2021 04.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2021 Mar 01 0359 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

WARNING
Geomagnetic K-index of 5 expected
Publié: Mar 1, 2021 03.49 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Mar 01 0350 UTC
Valid To: 2021 Mar 01 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

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

ALERT
Geomagnetic K-index of 4
Publié: Mar 1, 2021 03.46 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Mar 01 0345 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: Mar 1, 2021 02.56 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Mar 01 0300 UTC
Valid To: 2021 Mar 01 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: Feb 28, 2021 07.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3106
Begin Time: 2021 Feb 26 1230 UTC
Yesterday Maximum 2MeV Flux: 1629 pfu

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

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: Feb 27, 2021 20.47 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Feb 28: None (Below G1) Mar 01: None (Below G1) Mar 02: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: Feb 27, 2021 13.36 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3105
Begin Time: 2021 Feb 26 1230 UTC
Yesterday Maximum 2MeV Flux: 6370 pfu

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

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: Feb 26, 2021 12.47 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2021 Feb 26 1230 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: Feb 25, 2021 05.35 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3839
Valid From: 2021 Feb 24 0600 UTC
Now Valid Until: 2021 Feb 25 1200 UTC
Warning Condition: Persistence

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: Feb 24, 2021 23.43 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3838
Valid From: 2021 Feb 24 0600 UTC
Now Valid Until: 2021 Feb 25 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.

WARNING
Geomagnetic K-index of 5 expected
Publié: Feb 24, 2021 20.15 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Feb 24 2015 UTC
Valid To: 2021 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: Feb 24, 2021 17.57 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3837
Valid From: 2021 Feb 24 0600 UTC
Now Valid Until: 2021 Feb 24 2359 UTC
Warning Condition: Persistence

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

WARNING
Geomagnetic K-index of 5 expected
Publié: Feb 24, 2021 08.30 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Feb 24 0830 UTC
Valid To: 2021 Feb 24 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: Feb 24, 2021 08.30 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3836
Valid From: 2021 Feb 24 0600 UTC
Now Valid Until: 2021 Feb 24 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 4
Publié: Feb 24, 2021 08.16 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Feb 24 0815 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: Feb 24, 2021 06.02 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Feb 24 0600 UTC
Valid To: 2021 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: Feb 24, 2021 05.17 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3103
Begin Time: 2021 Feb 21 0535 UTC
Yesterday Maximum 2MeV Flux: 14236 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: Feb 23, 2021 05.29 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3834
Valid From: 2021 Feb 22 2042 UTC
Now Valid Until: 2021 Feb 23 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: Feb 23, 2021 04.59 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3102
Begin Time: 2021 Feb 21 0535 UTC
Yesterday Maximum 2MeV Flux: 9239 pfu

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

ALERT
Geomagnetic K-index of 4
Publié: Feb 23, 2021 02.31 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Feb 23 0229 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: Feb 22, 2021 20.42 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Feb 22 2042 UTC
Valid To: 2021 Feb 23 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: Feb 22, 2021 11.41 UTC
Geomagnetic Storm Category G1 Predicted

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

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: Feb 22, 2021 08.33 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3101
Begin Time: 2021 Feb 21 0535 UTC
Yesterday Maximum 2MeV Flux: 6702 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: Feb 21, 2021 23.43 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3832
Valid From: 2021 Feb 19 2034 UTC
Now Valid Until: 2021 Feb 22 1200 UTC
Warning Condition: Persistence

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: Feb 21, 2021 10.40 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3831
Valid From: 2021 Feb 19 2034 UTC
Now Valid Until: 2021 Feb 21 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
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: Feb 21, 2021 05.57 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2021 Feb 21 0535 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: Feb 20, 2021 23.22 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3830
Valid From: 2021 Feb 19 2034 UTC
Now Valid Until: 2021 Feb 21 1200 UTC
Warning Condition: Persistence

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: Feb 20, 2021 17.59 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3829
Valid From: 2021 Feb 19 2034 UTC
Now Valid Until: 2021 Feb 20 2359 UTC
Warning Condition: Persistence

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: Feb 20, 2021 04.59 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3828
Valid From: 2021 Feb 19 2034 UTC
Now Valid Until: 2021 Feb 20 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 4 expected
Publié: Feb 19, 2021 20.34 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Feb 19 2034 UTC
Valid To: 2021 Feb 20 0600 UTC
Warning Condition: Persistence

Comment: New warning supercedes the original with valid start time of 19/1411 UTC

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 Serial Number
3826
Publié: Feb 19, 2021 20.31 UTC
3826
Original Issue Time:

Comment: Cancelling current warning due to program error. Will issue one to replace it with an ending time of Feb 20 0600 UTC

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: Feb 19, 2021 20.17 UTC
Geomagnetic K-index of 5 expected
Valid From: 2021 Feb 19 2015 UTC
Valid To: 2021 Feb 20 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.

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: Feb 19, 2021 18.20 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Feb 20: G1 (Minor) Feb 21: None (Below G1) Feb 22: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: Feb 19, 2021 17.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3825
Valid From: 2021 Feb 19 1411 UTC
Now Valid Until: 2021 Feb 19 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 4
Publié: Feb 19, 2021 14.43 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Feb 19 1434 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: Feb 19, 2021 14.11 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Feb 19 1411 UTC
Valid To: 2021 Feb 19 1800 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: Feb 18, 2021 17.06 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Feb 19: None (Below G1) Feb 20: None (Below G1) Feb 21: 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: Feb 16, 2021 11.44 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3823
Valid From: 2021 Feb 16 0528 UTC
Now Valid Until: 2021 Feb 16 1500 UTC
Warning Condition: Onset

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

ALERT
Geomagnetic K-index of 4
Publié: Feb 16, 2021 05.38 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Feb 16 0536 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: Feb 16, 2021 05.29 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Feb 16 0528 UTC
Valid To: 2021 Feb 16 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: Feb 13, 2021 10.47 UTC
Geomagnetic K-index of 4
Threshold Reached: 2021 Feb 13 1045 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: Feb 13, 2021 04.21 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Feb 13 0420 UTC
Valid To: 2021 Feb 13 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: Feb 8, 2021 23.33 UTC
Geomagnetic K-index of 4 expected
Valid From: 2021 Feb 08 2331 UTC
Valid To: 2021 Feb 09 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: Feb 7, 2021 14.53 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3819
Valid From: 2021 Feb 06 2000 UTC
Now Valid Until: 2021 Feb 07 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
21-02-7 73 0 0 0 * 0 0 0 0 0 0 0
21-02-8 74 0 0 0 * 0 0 0 0 0 0 0
21-02-9 70 0 0 0 * 0 0 0 0 0 0 0
21-02-10 74 0 0 0 * 0 0 0 0 0 0 0
21-02-11 76 0 0 0 * 0 0 0 0 0 0 0
21-02-12 72 0 0 0 * 0 0 0 0 0 0 0
21-02-13 71 0 0 0 * 0 0 0 0 0 0 0
21-02-14 71 0 0 0 * 0 0 0 0 0 0 0
21-02-15 70 0 0 0 * 0 0 0 0 0 0 0
21-02-16 71 0 0 0 * 0 0 0 0 0 0 0
21-02-17 72 0 0 0 * 0 0 0 0 0 0 0
21-02-18 71 12 15 1 * 0 0 0 0 0 0 0
21-02-19 73 12 30 1 * 0 0 0 0 0 0 0
21-02-20 76 12 10 0 * 0 0 0 0 0 0 0
21-02-21 75 11 10 0 * 0 0 0 0 0 0 0
21-02-22 76 26 40 2 * 0 0 0 3 0 0 0
21-02-23 78 31 100 0 * 0 0 0 1 0 0 0
21-02-24 81 33 150 0 * 0 0 0 2 0 0 0
21-02-25 80 31 200 0 * 0 0 0 1 0 0 0
21-02-26 80 16 170 0 * 0 0 0 2 0 0 0
21-02-27 79 14 190 0 * 1 0 0 1 0 0 0
21-02-28 78 13 120 0 * 1 0 0 1 0 0 0
21-03-1 71 0 0 0 * 0 0 0 0 0 0 0
21-03-2 75 28 30 2 * 1 0 0 0 0 0 0
21-03-3 74 30 60 0 * 0 0 0 1 0 0 0
21-03-4 81 32 40 0 * 0 0 0 0 0 0 0
21-03-5 73 14 10 0 * 0 0 0 0 0 0 0
21-03-6 77 23 20 0 * 0 0 0 0 0 0 0
21-03-7 78 14 10 0 * 0 0 0 1 0 0 0
21-03-8 80 12 20 0 * 0 0 0 0 0 0 0
Moyenne/Total 75 12 41 6 3 0 0 13 0 0 0

Graphique de synthèse

éclairs

Solar wind

Solar Wind

The solar wind is a stream of plasma released from the upper atmosphere of the Sun. It consists of mostly electrons, protons and alpha particles with energies usually between 1.5 and 10 keV. The stream of particles varies in density, temperature, and speed over time and over solar longitude. These particles can escape the Sun's gravity because of their high energy, from the high temperature of the corona and magnetic, electrical and electromagnetic phenomena in it.

The solar wind is divided into two components, respectively termed the slow solar wind and the fast solar wind. The slow solar wind has a velocity of about 400 km/s, a temperature of 1.4–1.6×10e6 K and a composition that is a close match to the corona. By contrast, the fast solar wind has a typical velocity of 750 km/s, a temperature of 8×10e5 K and it nearly matches the composition of the Sun's photosphere. The slow solar wind is twice as dense and more variable in intensity than the fast solar wind. The slow wind also has a more complex structure, with turbulent regions and large-scale structures.

Solar radio flux at 10.7 cm

Solar radio flux at 10.7 cm

The solar radio flux at 10.7 cm (2800 MHz) is an excellent indicator of solar activity. Often called the F10.7 index, it is one of the longest running records of solar activity. The F10.7 radio emissions originates high in the chromosphere and low in the corona of the solar atmosphere. The F10.7 correlates well with the sunspot number as well as a number of UltraViolet (UV) and visible solar irradiance records. Reported in “solar flux units”, (s.f.u.), the F10.7 can vary from below 50 s.f.u., to above 300 s.f.u., over the course of a solar cycle.

Flares

Flares

A solar flare is a sudden flash of brightness observed over the Sun's surface or the solar limb, which is interpreted as a large energy release of up to 6 × 10e25 joules of energy. They are often, but not always, followed by a colossal coronal mass ejection. The flare ejects clouds of electrons, ions, and atoms through the corona of the sun into space. These clouds typically reach Earth a day or two after the event.

Solar flares affect all layers of the solar atmosphere (photosphere, chromosphere, and corona), when the plasma medium is heated to tens of millions of kelvin, while the electrons, protons, and heavier ions are accelerated to near the speed of light. They produce radiation across the electromagnetic spectrum at all wavelengths, from radio waves to gamma rays, although most of the energy is spread over frequencies outside the visual range and for this reason the majority of the flares are not visible to the naked eye and must be observed with special instruments. Flares occur in active regions around sunspots, where intense magnetic fields penetrate the photosphere to link the corona to the solar interior. Flares are powered by the sudden (timescales of minutes to tens of minutes) release of magnetic energy stored in the corona. The same energy releases may produce coronal mass ejections (CME), although the relation between CMEs and flares is still not well established.

The frequency of occurrence of solar flares varies, from several per day when the Sun is particularly "active" to less than one every week when the Sun is "quiet", following the 11-year cycle (the solar cycle). Large flares are less frequent than smaller ones.

Classification

Solar flares are classified as A, B, C, M or X according to the peak flux (in watts per square metre, W/m2) of 100 to 800 picometre X-rays near Earth, as measured on the GOES spacecraft.

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

Sunspots are temporary phenomena on the photosphere of the Sun that appear visibly as dark spots compared to surrounding regions. They correspond to concentrations of magnetic field that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere. Sunspots usually appear in pairs, with pair members of opposite magnetic polarity. The number of sunspots varies according to the approximately 11-year solar cycle.

Sunspot populations quickly rise and more slowly fall on an irregular cycle of 11 years, although significant variations in the number of sunspots attending the 11-year period are known over longer spans of time. For example, from 1900 to the 1960s, the solar maxima trend of sunspot count has been upward; from the 1960s to the present, it has diminished somewhat. Over the last decades the Sun has had a markedly high average level of sunspot activity; it was last similarly active over 8,000 years ago.

The number of sunspots correlates with the intensity of solar radiation over the period since 1979, when satellite measurements of absolute radiative flux became available. Since sunspots are darker than the surrounding photosphere it might be expected that more sunspots would lead to less solar radiation and a decreased solar constant. However, the surrounding margins of sunspots are brighter than the average, and so are hotter; overall, more sunspots increase the Sun's solar constant or brightness. The variation caused by the sunspot cycle to solar output is relatively small, on the order of 0.1% of the solar constant (a peak-to-trough range of 1.3 W/m2 compared to 1366 W/m2 for the average solar constant).

K-indices



Aujourd’hui


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Data


Estimated Planetary

Estimated Planetary

Date A K-indices (UTC)
0h 3h 6h 9h 12h 15h 18h 21h
21-02-8 6 1 2 1 2 1 1 1 3
21-02-9 4 2 2 2 2 1 0 0 0
21-02-10 3 1 0 1 1 1 0 0 0
21-02-11 4 1 1 2 1 1 1 0 0
21-02-12 5 0 1 0 0 1 2 2 3
21-02-13 13 3 3 2 4 3 1 1 2
21-02-14 4 2 1 2 1 1 1 1 0
21-02-15 5 1 0 2 1 1 1 2 3
21-02-16 15 2 4 4 4 2 3 2 1
21-02-17 8 2 3 2 2 2 2 2 2
21-02-18 5 3 2 1 1 1 0 0 1
21-02-19 17 2 1 2 2 4 4 4 4
21-02-20 20 3 3 4 3 3 4 4 4
21-02-21 20 4 4 4 4 4 2 2 3
21-02-22 17 4 4 3 3 3 2 3 3
21-02-23 12 4 3 3 3 3 2 2 1
21-02-24 21 3 3 4 3 2 4 4 4
21-02-25 13 4 3 3 2 1 3 3 3
21-02-26 11 3 3 1 3 2 2 3 2
21-02-27 4 1 2 2 1 1 1 1 1
21-02-28 6 1 2 1 0 1 1 2 3
21-03-1 26 3 6 5 4 2 2 3 2
21-03-2 20 2 3 3 2 3 4 5 4
21-03-3 23 5 5 5 3 3 2 2 3
21-03-4 11 4 3 1 1 2 2 2 3
21-03-5 5 2 2 2 2 1 0 2 2
21-03-6 16 4 4 3 3 3 1 2 2
21-03-7 10 3 2 1 2 0 3 1 4
21-03-8 6 1 1 1 1 1 1 3 2
21-03-9 6 2 0 1

Middle Latitude

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

High Latitude

Date A K-indices
21-02-8 5 1 1 2 3 1 1 0 2
21-02-9 6 1 1 3 4 1 0 0 0
21-02-10 4 0 0 0 3 3 0 0 0
21-02-11 5 0 0 2 4 1 0 0 0
21-02-12 3 0 0 0 1 2 1 2 2
21-02-13 18 2 2 3 6 4 1 0 1
21-02-14 2 1 1 1 0 1 1 0 0
21-02-15 2 0 0 2 1 0 0 1 1
21-02-16 45 1 3 7 7 4 4 2 1
21-02-17 10 1 1 2 4 4 2 1 1
21-02-18 5 1 1 3 3 1 0 0 0
21-02-19 31 0 0 3 5 5 6 4 4
21-02-20 40 2 3 6 6 5 5 3 4
21-02-21 49 3 4 6 7 6 4 3 2
21-02-22 23 3 4 5 4 5 2 1 2
21-02-23 20 3 2 4 5 5 3 1 0
21-02-24 31 2 3 5 5 4 5 5 2
21-02-25 21 3 4 4 5 3 2 3 3
21-02-26 13 2 1 1 5 4 2 2 1
21-02-27 3 0 1 1 2 1 1 0 1
21-02-28 2 0 1 0 0 1 0 1 1
21-03-1 34 1 6 5 6 4 3 3 1
21-03-2 24 1 2 4 3 5 5 4 3
21-03-3 36 4 6 6 5 4 3 2 2
21-03-4 12 3 2 0 1 4 4 2 2
21-03-5 5 1 0 3 3 1 0 1 0
21-03-6 27 2 3 5 6 5 2 2 1
21-03-7 7 2 1 0 3 1 3 1 2
21-03-8 4 0 0 0 0 3 1 2 1
21-03-9 1 0 0

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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