Retro snapshotSeverity · G4
Space weather · 2017-09-08
September 2017 storms — strongest of solar cycle 24. X9.3 flare on 2017-09-06 (the largest in over a decade at the time), followed by an X8.2 limb flare on 2017-09-10. G4 storm; HF radio blackouts over Caribbean during Hurricane Irma response.
G4 — severe. Possible widespread voltage problems; satellite surface charging risk. Aurora to ~45° geomag.
Kp peak
8.0
Flares
8
largest X9.3
CMEs
5
fastest 1,418 km/s
Storms
1
±2-day window
Event chain · UTC
DONKI catalogue · ±2 days
NOAA SWPC
NOAA SWPCPD-USG
NOAA SWPC archive — September 2017 storms.
https://www.swpc.noaa.gov/news/severe-geomagnetic-storm-watch-issued
retrieved Jan 01, 2024, 12:00 AM UTC
09-0609-0709-0809-0909-10
- FlareX9.3AR-2673Sep 06, 2017, 11:53 AMZ
- CMEHaloSep 06, 2017, 12:24 PMZ
- StormKp 8Sep 07, 2017, 11:50 PMZ
- FlareX8.2AR-2673Sep 10, 2017, 03:35 PMZ
More retro events