Geomagnetic Storms of 1990
58 geomagnetic storms of G1 or more began in 1990: 32 G1, 14 G2, 8 G3, 4 G4, 0 G5. The strongest began June 12, 1990 and reached Kp 8+, rank 88 of every storm since 1932.
By month
Every storm of 1990
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 3, 00:00 | G1 Minor | 5 | 3 | 15 |
| Jan 24, 00:00 | G1 Minor | 5 | 3 | 33 |
| Jan 24, 18:00 | G1 Minor | 5 | 9 | 33 |
| Jan 30, 18:00 | G1 Minor | 5 | 3 | 24 |
| Feb 1, 18:00 | G1 Minor | 5 | 3 | 22 |
| Feb 4, 15:00 | G1 Minor | 5+ | 9 | 29 |
| Feb 7, 21:00 | G1 Minor | 5 | 3 | 25 |
| Feb 14, 03:00 | G2 Moderate | 6+ | 6 | 30 |
| Feb 15, 18:00 | G3 Strong | 7- | 12 | 50 |
| Feb 17, 00:00 | G2 Moderate | 6 | 6 | 33 |
| Feb 19, 00:00 | G1 Minor | 5 | 3 | 33 |
| Feb 19, 21:00 | G1 Minor | 5 | 3 | 33 |
| Feb 20, 18:00 | G1 Minor | 5+ | 3 | 38 |
| Feb 23, 00:00 | G1 Minor | 5 | 3 | 36 |
| Feb 23, 15:00 | G1 Minor | 5+ | 12 | 36 |
| Feb 25, 03:00 | G1 Minor | 5 | 3 | 29 |
| Feb 27, 06:00 | G1 Minor | 5 | 3 | 26 |
| Feb 28, 03:00 | G2 Moderate | 6 | 6 | 31 |
| Mar 6, 00:00 | G1 Minor | 5 | 3 | 21 |
| Mar 12, 15:00 | G3 Strong | 7+ | 12 | 43 |
| Mar 14, 00:00 | G1 Minor | 5+ | 3 | 26 |
| Mar 18, 12:00 | G2 Moderate | 6- | 15 | 35 |
| Mar 20, 21:00 | G3 Strong | 7+ | 24 | 77 |
| Mar 25, 15:00 | G2 Moderate | 6 | 30 | 41 |
| Mar 27, 18:00 | G1 Minor | 5+ | 6 | 34 |
| Mar 29, 12:00 | G4 Severe | 8 | 30 | 69 |
| Apr 9, 09:00 | G4 Severe | 8 | 141 | 124 |
| Apr 17, 09:00 | G2 Moderate | 6 | 21 | 40 |
| Apr 20, 18:00 | G1 Minor | 5 | 3 | 18 |
| Apr 23, 03:00 | G2 Moderate | 6- | 15 | 37 |
| Apr 24, 06:00 | G2 Moderate | 6 | 6 | 30 |
| Apr 26, 03:00 | G1 Minor | 5+ | 3 | 16 |
| Apr 29, 21:00 | G2 Moderate | 6- | 6 | 30 |
| May 10, 03:00 | G2 Moderate | 6- | 6 | 33 |
| May 11, 03:00 | G1 Minor | 5+ | 3 | 24 |
| May 18, 12:00 | G2 Moderate | 6+ | 6 | 31 |
| May 21, 21:00 | G1 Minor | 5+ | 18 | 32 |
| May 26, 12:00 | G3 Strong | 7+ | 24 | 47 |
| May 30, 18:00 | G1 Minor | 5 | 3 | 23 |
| Jun 7, 03:00 | G1 Minor | 5+ | 3 | 22 |
| Jun 9, 06:00 | G2 Moderate | 6- | 9 | 32 |
| Jun 12, 12:00 | G4 Severe | 8+ | 54 | 89 |
| Jul 26, 18:00 | G1 Minor | 5+ | 3 | 14 |
| Jul 28, 06:00 | G4 Severe | 8- | 33 | 102 |
| Aug 1, 12:00 | G1 Minor | 5 | 9 | 26 |
| Aug 14, 06:00 | G1 Minor | 5+ | 3 | 19 |
| Aug 15, 12:00 | G1 Minor | 5 | 3 | 26 |
| Aug 21, 12:00 | G3 Strong | 7 | 66 | 77 |
| Aug 26, 06:00 | G3 Strong | 7- | 15 | 63 |
| Aug 30, 12:00 | G1 Minor | 5+ | 6 | 26 |
| Sep 1, 12:00 | G3 Strong | 7- | 3 | 26 |
| Sep 16, 09:00 | G1 Minor | 5 | 3 | 23 |
| Sep 20, 21:00 | G1 Minor | 5+ | 3 | 16 |
| Oct 10, 00:00 | G2 Moderate | 6 | 54 | 48 |
| Oct 20, 15:00 | G1 Minor | 5 | 3 | 23 |
| Oct 24, 00:00 | G1 Minor | 5 | 3 | 25 |
| Oct 30, 00:00 | G2 Moderate | 6- | 3 | 20 |
| Nov 27, 15:00 | G3 Strong | 7- | 6 | 45 |
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.