Geomagnetic Storms of 2017
26 geomagnetic storms of G1 or more began in 2017: 14 G1, 9 G2, 2 G3, 1 G4, 0 G5. The strongest began September 7, 2017 and reached Kp 8+, rank 107 of every storm since 1932.
By month
Every storm of 2017
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Feb 1, 15:00 | G1 Minor | 5 | 9 | 28 |
| Mar 1, 18:00 | G2 Moderate | 6- | 9 | 35 |
| Mar 6, 18:00 | G1 Minor | 5 | 3 | 23 |
| Mar 21, 18:00 | G1 Minor | 5+ | 3 | 24 |
| Mar 27, 03:00 | G2 Moderate | 6+ | 27 | 47 |
| Apr 20, 03:00 | G2 Moderate | 6- | 3 | 28 |
| Apr 21, 18:00 | G2 Moderate | 6- | 45 | 47 |
| May 27, 21:00 | G3 Strong | 7 | 15 | 47 |
| Jun 11, 15:00 | G1 Minor | 5 | 3 | 15 |
| Jun 16, 21:00 | G1 Minor | 5 | 3 | 23 |
| Jul 9, 00:00 | G1 Minor | 5+ | 12 | 24 |
| Jul 16, 09:00 | G2 Moderate | 6 | 12 | 44 |
| Jul 17, 15:00 | G2 Moderate | 6- | 3 | 27 |
| Aug 20, 03:00 | G1 Minor | 5 | 3 | 20 |
| Aug 31, 06:00 | G1 Minor | 5+ | 9 | 30 |
| Sep 7, 21:00 | G4 Severe | 8+ | 24 | 106 |
| Sep 12, 21:00 | G1 Minor | 5+ | 6 | 17 |
| Sep 14, 15:00 | G2 Moderate | 6- | 12 | 35 |
| Sep 15, 18:00 | G1 Minor | 5+ | 12 | 35 |
| Sep 27, 18:00 | G3 Strong | 7- | 15 | 51 |
| Oct 12, 00:00 | G1 Minor | 5 | 3 | 27 |
| Oct 13, 12:00 | G2 Moderate | 6- | 24 | 37 |
| Oct 15, 03:00 | G1 Minor | 5+ | 3 | 25 |
| Nov 7, 18:00 | G2 Moderate | 6+ | 21 | 44 |
| Nov 21, 03:00 | G1 Minor | 5 | 3 | 27 |
| Dec 5, 12:00 | G1 Minor | 5 | 3 | 28 |
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.