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La météorologie de l\'espace

La vitesse du vent solaire Vent solaire champs magnétiques Flux radio 10,7 cm à midi
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EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2025-07-18 14.37 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5041
Valid From: 2025 Jul 17 0840 UTC
Now Valid Until: 2025 Jul 18 2359 UTC
Warning Condition: Persistence

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2025-07-18 05.00 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3497
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 6590 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2025-07-17 20.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5040
Valid From: 2025 Jul 17 0840 UTC
Now Valid Until: 2025 Jul 18 1500 UTC
Warning Condition: Persistence

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-07-17 08.52 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3496
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 4840 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 4
Publié: 2025-07-17 08.51 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 17 0851 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: 2025-07-17 08.41 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 17 0840 UTC
Valid To: 2025 Jul 17 2100 UTC
Warning Condition: Onset

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-07-16 23.34 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3495
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 1010 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 5
Publié: 2025-07-16 23.07 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jul 16 2301 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

WARNING
Geomagnetic K-index of 5 expected
Publié: 2025-07-16 22.54 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jul 16 2254 UTC
Valid To: 2025 Jul 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.

ALERT
Geomagnetic K-index of 4
Publié: 2025-07-16 22.43 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 16 2205 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: 2025-07-16 21.41 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 16 2140 UTC
Valid To: 2025 Jul 17 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: 2025-07-16 11.47 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5037
Valid From: 2025 Jul 16 0240 UTC
Now Valid Until: 2025 Jul 16 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: 2025-07-16 11.46 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 16 1146 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-07-16 05.17 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3494
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 1910 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-07-16 02.41 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 16 0240 UTC
Valid To: 2025 Jul 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-07-15 12.12 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3493
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 1230 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Type II Radio Emission
Publié: 2025-07-15 12.10 UTC
Type II Radio Emission
Begin Time: 2025 Jul 15 1052 UTC
Estimated Velocity: 525 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 2025-07-15 11.47 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2079
Valid From: 2025 Jul 14 2051 UTC
Now Valid Until: 2025 Jul 15 1800 UTC
Warning Condition: persistence

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-07-15 11.47 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5035
Valid From: 2025 Jul 14 1858 UTC
Now Valid Until: 2025 Jul 15 2100 UTC
Warning Condition: persistence

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

ALERT
Geomagnetic K-index of 5
Publié: 2025-07-15 10.56 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jul 15 1056 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

ALERT
Geomagnetic K-index of 5
Publié: 2025-07-15 09.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jul 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.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Publié: 2025-07-15 02.24 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2078
Valid From: 2025 Jul 14 2051 UTC
Now Valid Until: 2025 Jul 15 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: 2025-07-15 02.24 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5034
Valid From: 2025 Jul 14 1858 UTC
Now Valid Until: 2025 Jul 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 5
Publié: 2025-07-14 21.09 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jul 14 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 4
Publié: 2025-07-14 20.54 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 14 2035 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 5 expected
Publié: 2025-07-14 20.52 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jul 14 2051 UTC
Valid To: 2025 Jul 15 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.

WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-07-14 18.59 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 14 1858 UTC
Valid To: 2025 Jul 15 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.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-07-14 15.52 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Jul 14 1550 UTC
Station: GOES-19

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

ALERT
Type II Radio Emission
Publié: 2025-07-14 11.35 UTC
Type II Radio Emission
Begin Time: 2025 Jul 14 1045 UTC
Estimated Velocity: 205 km/s

Comment: Faint signature.
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-07-13 11.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5032
Valid From: 2025 Jul 11 0510 UTC
Now Valid Until: 2025 Jul 13 2359 UTC
Warning Condition: persistence

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

ALERT
Geomagnetic K-index of 5
Publié: 2025-07-13 04.33 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jul 13 0433 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: 2025-07-13 04.19 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jul 13 0418 UTC
Valid To: 2025 Jul 13 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: 2025-07-12 23.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5031
Valid From: 2025 Jul 11 0510 UTC
Now Valid Until: 2025 Jul 13 1200 UTC
Warning Condition: persistence

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-07-12 08.31 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5030
Valid From: 2025 Jul 11 0510 UTC
Now Valid Until: 2025 Jul 12 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: 2025-07-11 20.43 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jul 11 2040 UTC
Valid To: 2025 Jul 12 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: 2025-07-11 17.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5029
Valid From: 2025 Jul 11 0510 UTC
Now Valid Until: 2025 Jul 12 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: 2025-07-11 11.08 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5028
Valid From: 2025 Jul 11 0510 UTC
Now Valid Until: 2025 Jul 11 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.

WARNING
Geomagnetic K-index of 5 expected
Publié: 2025-07-11 11.08 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jul 11 1108 UTC
Valid To: 2025 Jul 11 1800 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

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

ALERT
Geomagnetic K-index of 4
Publié: 2025-07-11 11.04 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 11 1104 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: 2025-07-11 05.12 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 11 0510 UTC
Valid To: 2025 Jul 11 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: 2025-07-10 11.02 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3491
Begin Time: 2025 Jul 09 1425 UTC
Yesterday Maximum 2MeV Flux: 1210 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-07-09 14.33 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Jul 09 1425 UTC
Station: GOES-19

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

ALERT
Geomagnetic K-index of 4
Publié: 2025-07-08 06.03 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 08 0559 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-07-08 05.43 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5026
Valid From: 2025 Jul 07 2321 UTC
Now Valid Until: 2025 Jul 08 1500 UTC
Warning Condition: Persistence

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

WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-07-07 23.21 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 07 2321 UTC
Valid To: 2025 Jul 08 0600 UTC
Warning Condition: Onset

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-07-07 05.50 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5024
Valid From: 2025 Jul 04 2248 UTC
Now Valid Until: 2025 Jul 07 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: 2025-07-07 05.49 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2073
Valid From: 2025 Jul 06 2320 UTC
Now Valid Until: 2025 Jul 07 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.

WARNING
Geomagnetic K-Index of 6 expected
Publié: 2025-07-07 01.51 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Jul 07 0150 UTC
Valid To: 2025 Jul 07 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

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

ALERT
Geomagnetic K-index of 5
Publié: 2025-07-07 01.25 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jul 07 0124 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: 2025-07-06 23.53 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jul 06 2350 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-07-06 23.41 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5023
Valid From: 2025 Jul 04 2248 UTC
Now Valid Until: 2025 Jul 07 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: 2025-07-06 23.21 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jul 06 2320 UTC
Valid To: 2025 Jul 07 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: 2025-07-06 14.28 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5022
Valid From: 2025 Jul 04 2248 UTC
Now Valid Until: 2025 Jul 06 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: 2025-07-06 05.39 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jul 06 0538 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 4 expected
Publié: 2025-07-06 04.23 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5021
Valid From: 2025 Jul 04 2248 UTC
Now Valid Until: 2025 Jul 06 1500 UTC
Warning Condition: Persistence

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

WARNING
Geomagnetic K-index of 5 expected
Publié: 2025-07-06 04.22 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jul 06 0420 UTC
Valid To: 2025 Jul 06 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: 2025-07-05 23.02 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5020
Valid From: 2025 Jul 04 2248 UTC
Now Valid Until: 2025 Jul 06 0600 UTC
Warning Condition: Persistence

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-07-05 14.19 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5019
Valid From: 2025 Jul 04 2248 UTC
Now Valid Until: 2025 Jul 05 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: 2025-07-05 05.16 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5018
Valid From: 2025 Jul 04 2248 UTC
Now Valid Until: 2025 Jul 05 1500 UTC
Warning Condition: Persistence

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

ALERT
Geomagnetic K-index of 4
Publié: 2025-07-04 23.53 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 04 2248 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: 2025-07-04 22.49 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 04 2248 UTC
Valid To: 2025 Jul 05 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
Geomagnetic K-index of 4
Publié: 2025-07-03 14.44 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 03 1440 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-07-03 14.32 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3489
Begin Time: 2025 Jun 27 1310 UTC
Yesterday Maximum 2MeV Flux: 4925 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-07-03 14.17 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 03 1415 UTC
Valid To: 2025 Jul 04 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-07-02 05.28 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3488
Begin Time: 2025 Jun 27 1310 UTC
Yesterday Maximum 2MeV Flux: 2650 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-07-01 07.48 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3487
Begin Time: 2025 Jun 27 1310 UTC
Yesterday Maximum 2MeV Flux: 8730 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-07-01 01.12 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 01 0112 UTC
Valid To: 2025 Jul 01 0900 UTC
Warning Condition: Onset

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

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 2025-06-30 18.56 UTC
Geomagnetic Storm Category G1 Predicted

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

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-06-30 05.15 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3486
Begin Time: 2025 Jun 27 1310 UTC
Yesterday Maximum 2MeV Flux: 6349 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 2025-06-30 00.10 UTC
Geomagnetic Storm Category G1 Predicted

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

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-06-29 05.11 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3485
Begin Time: 2025 Jun 27 1310 UTC
Yesterday Maximum 2MeV Flux: 4190 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-06-28 05.10 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3484
Begin Time: 2025 Jun 27 1310 UTC
Yesterday Maximum 2MeV Flux: 2047 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-06-27 17.26 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5014
Valid From: 2025 Jun 25 1722 UTC
Now Valid Until: 2025 Jun 28 0600 UTC
Warning Condition: Persistence

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

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-06-27 13.27 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Jun 27 1310 UTC
Station: GOES19

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-06-27 05.46 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5013
Valid From: 2025 Jun 25 1722 UTC
Now Valid Until: 2025 Jun 27 2100 UTC
Warning Condition: Persistence

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

ALERT
Geomagnetic K-index of 5
Publié: 2025-06-27 01.39 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 27 0139 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

WARNING
Geomagnetic K-Index of 6 expected
Publié: 2025-06-26 22.35 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Jun 26 2235 UTC
Valid To: 2025 Jun 27 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

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

ALERT
Geomagnetic K-index of 5
Publié: 2025-06-26 22.31 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Jun 26 2230 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

WARNING
Geomagnetic K-index of 5 expected
Publié: 2025-06-26 22.22 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jun 26 2222 UTC
Valid To: 2025 Jun 27 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-06-26 17.54 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5012
Valid From: 2025 Jun 25 1722 UTC
Now Valid Until: 2025 Jun 27 0600 UTC
Warning Condition: Persistence

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-06-26 11.25 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5011
Valid From: 2025 Jun 25 1722 UTC
Now Valid Until: 2025 Jun 26 2359 UTC
Warning Condition: Persistence

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

WARNING
Geomagnetic K-index of 5 expected
Publié: 2025-06-25 20.27 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Jun 25 2026 UTC
Valid To: 2025 Jun 26 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

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

ALERT
Geomagnetic K-index of 4
Publié: 2025-06-25 20.05 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 25 2005 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes

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

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 2025-06-25 18.31 UTC
Geomagnetic Storm Category G1 Predicted

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

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

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

WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-06-25 17.22 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 25 1722 UTC
Valid To: 2025 Jun 26 1200 UTC
Warning Condition: Onset

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-06-25 13.24 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3482
Begin Time: 2025 Jun 23 1425 UTC
Yesterday Maximum 2MeV Flux: 1370 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-06-24 14.47 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3481
Begin Time: 2025 Jun 23 1425 UTC
Yesterday Maximum 2MeV Flux: 1270 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WATCH
Geomagnetic Storm Category G2 Predicted
Publié: 2025-06-23 17.00 UTC
Geomagnetic Storm Category G2 Predicted

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

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

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

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Publié: 2025-06-23 14.40 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Jun 23 1425 UTC
Station: GOES19

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

WATCH
Geomagnetic Storm Category G1 Predicted
Publié: 2025-06-22 21.16 UTC
Geomagnetic Storm Category G1 Predicted

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

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

ALERT
Geomagnetic K-index of 4
Publié: 2025-06-22 03.02 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 22 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

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

WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-06-22 01.42 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 22 0140 UTC
Valid To: 2025 Jun 22 1500 UTC
Warning Condition: Onset

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

ALERT
Geomagnetic K-index of 4
Publié: 2025-06-21 18.01 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 21 1759 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes

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

WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-06-21 05.38 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 21 0537 UTC
Valid To: 2025 Jun 21 2359 UTC
Warning Condition: Onset

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-06-20 11.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 5007
Valid From: 2025 Jun 19 1912 UTC
Now Valid Until: 2025 Jun 20 2359 UTC
Warning Condition: persistence

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

SUMMARY
X-ray Event exceeded X1
Publié: 2025-06-20 00.14 UTC
X-ray Event exceeded X1
Begin Time: 2025 Jun 19 2337 UTC
Maximum Time: 2025 Jun 19 2350 UTC
End Time: 2025 Jun 19 2354 UTC
X-ray Class: X1.9
Location: N18W38
NOAA Scale: R3 - Strong

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

SUMMARY
10cm Radio Burst
Publié: 2025-06-19 23.58 UTC
10cm Radio Burst
Begin Time: 2025 Jun 19 2346 UTC
Maximum Time: 2025 Jun 19 2347 UTC
End Time: 2025 Jun 19 2347 UTC
Duration: 1 minutes
Peak Flux: 250 sfu
Latest Penticton Noon Flux: 137 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

ALERT
X-Ray Flux exceeded M5
Publié: 2025-06-19 23.48 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2025 Jun 19 2347 UTC
NOAA Scale: R2 - Moderate

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

ALERT
Geomagnetic K-index of 4
Publié: 2025-06-19 20.42 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 19 2038 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes

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

WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-06-19 19.14 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 19 1912 UTC
Valid To: 2025 Jun 20 1200 UTC
Warning Condition: Onset

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

ALERT
Geomagnetic K-index of 4
Publié: 2025-06-18 23.33 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Jun 18 2327 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes

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

WARNING
Geomagnetic K-index of 4 expected
Publié: 2025-06-18 23.29 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Jun 18 2329 UTC
Valid To: 2025 Jun 19 0600 UTC
Warning Condition: Onset

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

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
2025-06-18 137 120 660 1 * 20 0 0 20 0 0 0
2025-06-19 136 113 890 1 * 9 0 1 14 1 0 0
2025-06-20 130 95 470 0 * 4 2 0 1 2 0 0
2025-06-21 120 87 710 0 * 1 0 0 0 0 0 0
2025-06-22 125 80 630 0 * 7 0 0 2 0 0 0
2025-06-23 122 105 470 3 * 7 0 0 2 0 0 0
2025-06-24 120 87 305 0 * 7 0 0 2 0 0 0
2025-06-25 117 90 320 1 * 4 0 0 7 0 0 0
2025-06-26 117 91 340 0 * 3 0 0 6 0 0 0
2025-06-27 118 111 340 3 * 3 0 0 3 0 0 0
2025-06-28 122 103 380 1 * 2 0 0 0 1 0 0
2025-06-29 128 151 380 2 * 2 0 0 0 0 0 0
2025-06-30 128 158 330 2 * 7 0 0 1 0 0 0
2025-07-01 126 144 300 2 * 1 0 0 3 0 0 0
2025-07-02 130 148 315 1 * 5 0 0 4 0 0 0
2025-07-03 125 118 300 0 * 5 0 0 0 0 0 0
2025-07-04 119 87 360 0 * 3 0 0 3 0 0 0
2025-07-05 117 82 220 0 * 2 0 0 3 0 0 0
2025-07-06 118 81 230 1 * 3 0 0 6 0 0 0
2025-07-07 118 96 290 1 * 9 0 0 1 0 0 0
2025-07-08 115 88 290 0 * 4 1 0 0 0 0 0
2025-07-09 120 83 290 2 * 3 1 0 1 0 0 0
2025-07-10 129 72 340 0 * 12 0 0 4 0 0 0
2025-07-11 132 98 490 3 * 11 0 0 23 1 0 0
2025-07-12 139 93 700 0 * 14 3 0 10 3 0 0
2025-07-13 128 102 710 1 * 16 0 0 3 0 0 0
2025-07-14 128 139 545 2 * 14 0 0 5 0 0 0
2025-07-15 139 146 585 2 * 2 0 0 7 0 0 0
2025-07-16 152 182 900 2 * 7 0 0 13 1 0 0
2025-07-17 156 178 1180 1 * 3 0 0 14 0 0 0
Moyenne/Total 127 111 476 32 190 7 1 158 9 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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2. 00 1. 00 2.



Data


Estimated Planetary

Estimated Planetary

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

Middle Latitude

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

High Latitude

Date A K-indices
2025-06-19 8 3 2 2 1 1 1 3 2
2025-06-20 13 1 2 4 3 4 3 2 1
2025-06-21 22 2 3 1 2 5 6 2 2
2025-06-22 14 3 3 2 4 4 2 2 2
2025-06-23 10 3 2 2 4 2 2 1 1
2025-06-24 7 1 2 2 3 2 2 1 1
2025-06-25 19 2 2 3 4 5 3 3 3
2025-06-26 41 4 4 3 5 6 6 4 4
2025-06-27 37 5 5 5 6 5 3 1 1
2025-06-28 20 2 2 5 5 4 2 2 2
2025-06-29 13 2 2 4 2 4 3 2 2
2025-06-30 27 4 3 3 6 2 5 3 2
2025-07-01 9 4 3 2 2 2 1 1 1
2025-07-02 11 0 1 3 4 4 2 2 1
2025-07-03 21 2 4 3 2 5 5 2 2
2025-07-04 16 3 4 5 2 2 2 2 2
2025-07-05 29 3 4 3 6 5 3 3 3
2025-07-06 37 5 5 4 6 5 2 2 4
2025-07-07 22 4 3 3 3 4 5 3 3
2025-07-08 19 3 4 3 4 2 5 2 2
2025-07-09 12 3 2 3 4 3 2 2 1
2025-07-10 2 1 1 1 1 0 1 1 0
2025-07-11 25 1 3 4 6 4 3 3 3
2025-07-12 29 3 4 4 6 5 3 2 3
2025-07-13 41 4 5 5 6 5 5 3 3
2025-07-14 16 2 3 3 4 3 3
2025-07-15 37 4 5 6 5 5 4 2 2
2025-07-16 24 4 4 4 6 2 1 2 3
2025-07-17 42 3 4 5 6 6 5 4 2
2025-07-18 2 2 2 5 5 3 2

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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