Retro snapshotSeverity · G5

Space weather · 2024-05-10

Gannon storm — a G5 (Kp 9) geomagnetic super-storm driven by a complex sequence of CMEs from active region AR-3664. ICAO SWX severe-advisory in effect 2024-05-09 18:00 UTC through 2024-05-12 06:00 UTC. Polar HF radio severely degraded; aurorae visible to ~25° geomagnetic latitude. Operators reported transient satellite drag spikes and minor surface charging events. Most intense storm since 2003.

G5 — extreme. Widespread voltage control problems; transformer damage possible. Aurora to very low geomagnetic latitudes.

Kp peak
9.0
Flares
12
largest X5.8
CMEs
7
fastest 1,493 km/s
Storms
1
±2-day window
Event chain · UTC

DONKI catalogue · ±2 days

NASA DONKI
NASA DONKIPD-USG

NASA GSFC CCMC, DONKI archive — 2024-05-10 G5 (Gannon) storm.

https://api.nasa.gov/DONKI/notifications?startDate=2024-05-08&endDate=2024-05-13&api_key=DEMO_KEY
retrieved May 13, 2024, 06:00 PM UTC
NOAA SWPC
NOAA SWPCPD-USG

NOAA Space Weather Prediction Center post-event summary, 2024-05-13.

https://www.swpc.noaa.gov/news/g5-conditions-observed
retrieved May 13, 2024, 06:00 PM UTC
05-0805-0905-1005-1105-12
  • FlareX2.2AR-3664May 09, 2024, 05:23 PMZ
  • CMES-typeMay 08, 2024, 05:09 AMZ
  • FlareX5.8AR-3664May 11, 2024, 01:10 AMZ
  • CMEHaloMay 09, 2024, 09:48 PMZ
  • StormKp 9Gannon stormMay 10, 2024, 04:00 PMZ
  • FlareX4.0AR-3664May 10, 2024, 06:54 AMZ
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