Geomagnetic Storms of 1985
52 geomagnetic storms of G1 or more began in 1985: 25 G1, 20 G2, 6 G3, 1 G4, 0 G5. The strongest began April 19, 1985 and reached Kp 8+, rank 96 of every storm since 1932.
By month
Every storm of 1985
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 1, 18:00 | G2 Moderate | 6- | 6 | 33 |
| Jan 8, 18:00 | G2 Moderate | 6 | 21 | 46 |
| Jan 10, 03:00 | G1 Minor | 5 | 3 | 29 |
| Jan 23, 03:00 | G2 Moderate | 6- | 9 | 37 |
| Jan 28, 00:00 | G2 Moderate | 6 | 27 | 58 |
| Jan 29, 21:00 | G2 Moderate | 6- | 3 | 25 |
| Feb 6, 00:00 | G2 Moderate | 6- | 21 | 46 |
| Feb 10, 18:00 | G1 Minor | 5 | 3 | 24 |
| Feb 27, 21:00 | G3 Strong | 7 | 18 | 60 |
| Mar 1, 03:00 | G1 Minor | 5+ | 3 | 16 |
| Mar 5, 06:00 | G2 Moderate | 6+ | 18 | 42 |
| Mar 8, 03:00 | G1 Minor | 5+ | 3 | 27 |
| Apr 1, 12:00 | G1 Minor | 5+ | 6 | 23 |
| Apr 8, 21:00 | G1 Minor | 5+ | 3 | 15 |
| Apr 9, 12:00 | G2 Moderate | 6+ | 6 | 38 |
| Apr 19, 21:00 | G4 Severe | 8+ | 45 | 103 |
| Apr 26, 03:00 | G1 Minor | 5 | 3 | 30 |
| Apr 27, 03:00 | G1 Minor | 5 | 3 | 33 |
| Apr 27, 21:00 | G3 Strong | 7 | 15 | 61 |
| Apr 29, 03:00 | G2 Moderate | 6 | 3 | 17 |
| Apr 30, 09:00 | G3 Strong | 7+ | 12 | 42 |
| May 2, 00:00 | G2 Moderate | 6 | 12 | 38 |
| Jun 6, 15:00 | G1 Minor | 5+ | 9 | 25 |
| Jun 9, 21:00 | G2 Moderate | 6+ | 9 | 30 |
| Jun 20, 15:00 | G1 Minor | 5 | 3 | 13 |
| Jul 1, 00:00 | G1 Minor | 5 | 3 | 14 |
| Jul 4, 12:00 | G2 Moderate | 6 | 9 | 33 |
| Jul 6, 21:00 | G1 Minor | 5 | 3 | 21 |
| Jul 12, 03:00 | G3 Strong | 7- | 18 | 48 |
| Jul 17, 09:00 | G1 Minor | 5 | 3 | 20 |
| Jul 31, 09:00 | G1 Minor | 5+ | 15 | 36 |
| Aug 12, 18:00 | G2 Moderate | 6+ | 15 | 41 |
| Aug 22, 09:00 | G1 Minor | 5 | 3 | 28 |
| Aug 25, 06:00 | G1 Minor | 5 | 3 | 18 |
| Aug 31, 06:00 | G1 Minor | 5 | 6 | 32 |
| Sep 14, 12:00 | G2 Moderate | 6+ | 3 | 29 |
| Sep 15, 18:00 | G2 Moderate | 6 | 21 | 33 |
| Sep 19, 09:00 | G2 Moderate | 6 | 21 | 35 |
| Sep 26, 09:00 | G1 Minor | 5 | 3 | 19 |
| Oct 5, 03:00 | G3 Strong | 7 | 36 | 66 |
| Oct 7, 15:00 | G1 Minor | 5 | 3 | 27 |
| Oct 15, 06:00 | G1 Minor | 5+ | 3 | 19 |
| Oct 21, 15:00 | G1 Minor | 5 | 3 | 16 |
| Nov 2, 18:00 | G2 Moderate | 6 | 9 | 32 |
| Nov 10, 21:00 | G1 Minor | 5 | 3 | 19 |
| Nov 13, 18:00 | G2 Moderate | 6 | 3 | 24 |
| Nov 19, 03:00 | G1 Minor | 5 | 3 | 14 |
| Nov 29, 18:00 | G3 Strong | 7+ | 21 | 52 |
| Dec 13, 09:00 | G1 Minor | 5+ | 6 | 30 |
| Dec 19, 06:00 | G2 Moderate | 6- | 15 | 41 |
| Dec 28, 03:00 | G1 Minor | 5+ | 6 | 35 |
| Dec 30, 00:00 | G2 Moderate | 6 | 18 | 46 |
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.