Geomagnetic Storms of 2011
22 geomagnetic storms of G1 or more began in 2011: 12 G1, 8 G2, 1 G3, 1 G4, 0 G5. The strongest began August 5, 2011 and reached Kp 8-, rank 273 of every storm since 1932.
By month
Every storm of 2011
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 7, 00:00 | G1 Minor | 5 | 3 | 16 |
| Feb 4, 18:00 | G2 Moderate | 6- | 9 | 22 |
| Feb 14, 21:00 | G1 Minor | 5+ | 3 | 13 |
| Feb 18, 06:00 | G1 Minor | 5 | 3 | 21 |
| Mar 1, 15:00 | G1 Minor | 5+ | 6 | 27 |
| Mar 11, 00:00 | G1 Minor | 5+ | 6 | 37 |
| Mar 11, 18:00 | G2 Moderate | 6- | 6 | 37 |
| Apr 6, 12:00 | G1 Minor | 5 | 3 | 26 |
| Apr 12, 12:00 | G1 Minor | 5 | 3 | 23 |
| Apr 20, 03:00 | G1 Minor | 5 | 3 | 16 |
| Apr 29, 21:00 | G1 Minor | 5+ | 3 | 13 |
| May 28, 06:00 | G2 Moderate | 6+ | 9 | 45 |
| May 29, 03:00 | G1 Minor | 5+ | 15 | 34 |
| Jun 4, 21:00 | G2 Moderate | 6+ | 6 | 25 |
| Jul 30, 18:00 | G1 Minor | 5 | 3 | 16 |
| Aug 5, 18:00 | G4 Severe | 8- | 12 | 42 |
| Sep 9, 15:00 | G2 Moderate | 6- | 12 | 40 |
| Sep 10, 21:00 | G2 Moderate | 6- | 3 | 40 |
| Sep 17, 09:00 | G1 Minor | 5+ | 9 | 32 |
| Sep 26, 15:00 | G2 Moderate | 6+ | 12 | 38 |
| Sep 29, 00:00 | G2 Moderate | 6- | 6 | 24 |
| Oct 24, 18:00 | G3 Strong | 7+ | 12 | 38 |
More
Sources
Kp and ap from GFZ Helmholtz Centre for Geosciences, Geomagnetic Observatory Niemegk, licensed CC BY 4.0: Matzka, J., Stolle, C., Yamazaki, Y., Bronkalla, O. and Morschhauser, A., 2021, The geomagnetic Kp index and derived indices of geomagnetic activity, Space Weather, doi:10.1029/2020SW002641; data doi:10.5880/Kp.0001. Storms, levels and aurora reach worked out by WeatherOverTime from those values and NOAA’s space weather scales. Definitive through August 31, 2026; later values are preliminary. Rebuilt 2026-09-24.