Geomagnetic Storms of 2021
16 geomagnetic storms of G1 or more began in 2021: 11 G1, 3 G2, 1 G3, 1 G4, 0 G5. The strongest began November 3, 2021 and reached Kp 8-, rank 252 of every storm since 1932.
By month
Every storm of 2021
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Mar 1, 03:00 | G2 Moderate | 6- | 6 | 25 |
| Mar 2, 18:00 | G1 Minor | 5 | 3 | 20 |
| Mar 14, 03:00 | G1 Minor | 5 | 3 | 23 |
| Mar 20, 06:00 | G2 Moderate | 6- | 3 | 27 |
| Mar 25, 00:00 | G1 Minor | 5 | 3 | 17 |
| Apr 16, 18:00 | G1 Minor | 5 | 3 | 19 |
| Apr 25, 00:00 | G1 Minor | 5 | 3 | 18 |
| May 12, 12:00 | G3 Strong | 7 | 6 | 42 |
| May 20, 12:00 | G1 Minor | 5+ | 3 | 24 |
| Jun 15, 18:00 | G1 Minor | 5 | 3 | 17 |
| Aug 28, 00:00 | G1 Minor | 5 | 3 | 14 |
| Sep 17, 18:00 | G1 Minor | 5+ | 6 | 23 |
| Oct 12, 00:00 | G2 Moderate | 6+ | 12 | 46 |
| Nov 3, 21:00 | G4 Severe | 8- | 18 | 72 |
| Nov 30, 21:00 | G1 Minor | 5+ | 3 | 10 |
| Dec 19, 21:00 | G1 Minor | 5 | 3 | 14 |
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.