Geomagnetic Storms of 2015
45 geomagnetic storms of G1 or more began in 2015: 25 G1, 14 G2, 4 G3, 2 G4, 0 G5. The strongest began June 22, 2015 and reached Kp 8+, rank 117 of every storm since 1932.
By month
Every storm of 2015
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 4, 15:00 | G1 Minor | 5+ | 12 | 18 |
| Jan 7, 06:00 | G2 Moderate | 6+ | 6 | 31 |
| Feb 1, 21:00 | G1 Minor | 5 | 6 | 27 |
| Feb 17, 21:00 | G1 Minor | 5 | 6 | 22 |
| Feb 24, 00:00 | G1 Minor | 5+ | 6 | 25 |
| Mar 1, 00:00 | G1 Minor | 5+ | 9 | 26 |
| Mar 2, 06:00 | G1 Minor | 5+ | 3 | 28 |
| Mar 17, 06:00 | G4 Severe | 8- | 36 | 108 |
| Mar 19, 09:00 | G1 Minor | 5 | 3 | 26 |
| Mar 22, 06:00 | G2 Moderate | 6+ | 3 | 24 |
| Apr 10, 00:00 | G1 Minor | 5+ | 9 | 33 |
| Apr 15, 09:00 | G1 Minor | 5+ | 6 | 28 |
| Apr 16, 18:00 | G2 Moderate | 6 | 9 | 42 |
| May 6, 12:00 | G1 Minor | 5+ | 3 | 23 |
| May 13, 00:00 | G2 Moderate | 6- | 21 | 46 |
| May 18, 21:00 | G1 Minor | 5+ | 6 | 15 |
| Jun 8, 06:00 | G2 Moderate | 6 | 12 | 36 |
| Jun 22, 15:00 | G4 Severe | 8+ | 24 | 73 |
| Jun 25, 06:00 | G2 Moderate | 6- | 9 | 32 |
| Jul 4, 18:00 | G1 Minor | 5+ | 12 | 22 |
| Jul 13, 03:00 | G1 Minor | 5 | 3 | 33 |
| Jul 13, 18:00 | G2 Moderate | 6- | 3 | 33 |
| Jul 23, 06:00 | G1 Minor | 5+ | 3 | 21 |
| Aug 7, 12:00 | G1 Minor | 5 | 3 | 18 |
| Aug 15, 09:00 | G2 Moderate | 6 | 24 | 35 |
| Aug 23, 06:00 | G1 Minor | 5+ | 3 | 26 |
| Aug 27, 03:00 | G2 Moderate | 6+ | 6 | 52 |
| Aug 27, 21:00 | G2 Moderate | 6+ | 24 | 52 |
| Sep 7, 15:00 | G2 Moderate | 6+ | 15 | 44 |
| Sep 9, 03:00 | G2 Moderate | 6 | 21 | 59 |
| Sep 11, 06:00 | G3 Strong | 7 | 12 | 60 |
| Sep 20, 06:00 | G3 Strong | 7 | 12 | 44 |
| Oct 5, 09:00 | G1 Minor | 5 | 3 | 18 |
| Oct 7, 03:00 | G3 Strong | 7+ | 36 | 74 |
| Oct 12, 15:00 | G1 Minor | 5 | 3 | 21 |
| Nov 3, 06:00 | G1 Minor | 5 | 3 | 29 |
| Nov 4, 03:00 | G1 Minor | 5+ | 12 | 31 |
| Nov 7, 03:00 | G2 Moderate | 6 | 6 | 38 |
| Nov 10, 06:00 | G1 Minor | 5+ | 9 | 37 |
| Nov 18, 21:00 | G1 Minor | 5 | 3 | 15 |
| Nov 30, 06:00 | G1 Minor | 5 | 3 | 17 |
| Dec 10, 03:00 | G1 Minor | 5 | 3 | 24 |
| Dec 14, 21:00 | G1 Minor | 5+ | 3 | 20 |
| Dec 20, 03:00 | G3 Strong | 7- | 30 | 70 |
| Dec 31, 12:00 | G2 Moderate | 6 | 21 | 35 |
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 2026-09-25.