Geomagnetic Storms of 1958
68 geomagnetic storms of G1 or more began in 1958: 32 G1, 18 G2, 11 G3, 4 G4, 3 G5. The strongest began July 8, 1958 and reached Kp 9, rank 12 of every storm since 1932.
By month
Every storm of 1958
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 18, 06:00 | G1 Minor | 5 | 3 | 30 |
| Jan 20, 21:00 | G3 Strong | 7- | 9 | 33 |
| Jan 26, 03:00 | G1 Minor | 5 | 3 | 16 |
| Feb 10, 15:00 | G5 Extreme | 9 | 54 | 199 |
| Feb 14, 03:00 | G1 Minor | 5 | 3 | 23 |
| Feb 18, 03:00 | G1 Minor | 5 | 3 | 32 |
| Feb 18, 18:00 | G1 Minor | 5 | 3 | 32 |
| Feb 21, 21:00 | G1 Minor | 5 | 3 | 31 |
| Mar 3, 18:00 | G1 Minor | 5 | 9 | 28 |
| Mar 5, 06:00 | G3 Strong | 7- | 6 | 39 |
| Mar 6, 00:00 | G1 Minor | 5+ | 6 | 36 |
| Mar 7, 03:00 | G1 Minor | 5+ | 3 | 27 |
| Mar 8, 00:00 | G1 Minor | 5 | 3 | 22 |
| Mar 12, 00:00 | G3 Strong | 7 | 9 | 64 |
| Mar 13, 03:00 | G2 Moderate | 6- | 18 | 48 |
| Mar 14, 12:00 | G2 Moderate | 6- | 3 | 20 |
| Mar 17, 09:00 | G1 Minor | 5 | 3 | 27 |
| Mar 18, 15:00 | G2 Moderate | 6- | 6 | 34 |
| Mar 19, 15:00 | G2 Moderate | 6- | 15 | 44 |
| Mar 20, 18:00 | G2 Moderate | 6 | 33 | 38 |
| Mar 24, 15:00 | G1 Minor | 5 | 12 | 33 |
| Mar 25, 15:00 | G2 Moderate | 6 | 3 | 33 |
| Mar 26, 12:00 | G1 Minor | 5+ | 6 | 27 |
| Mar 30, 12:00 | G2 Moderate | 6- | 6 | 32 |
| Apr 2, 06:00 | G1 Minor | 5+ | 12 | 34 |
| Apr 4, 18:00 | G2 Moderate | 6- | 12 | 36 |
| Apr 6, 21:00 | G1 Minor | 5 | 3 | 23 |
| Apr 15, 03:00 | G1 Minor | 5 | 3 | 25 |
| Apr 16, 21:00 | G2 Moderate | 6 | 51 | 54 |
| Apr 29, 03:00 | G1 Minor | 5+ | 3 | 31 |
| May 13, 21:00 | G2 Moderate | 6- | 12 | 38 |
| May 15, 03:00 | G1 Minor | 5 | 3 | 27 |
| May 26, 12:00 | G3 Strong | 7- | 6 | 39 |
| May 27, 21:00 | G1 Minor | 5 | 3 | 24 |
| May 29, 00:00 | G2 Moderate | 6+ | 15 | 53 |
| May 31, 15:00 | G4 Severe | 8 | 30 | 72 |
| Jun 6, 21:00 | G4 Severe | 8- | 15 | 77 |
| Jun 9, 00:00 | G1 Minor | 5 | 3 | 33 |
| Jun 9, 21:00 | G2 Moderate | 6 | 6 | 33 |
| Jun 14, 18:00 | G1 Minor | 5+ | 15 | 21 |
| Jun 21, 09:00 | G2 Moderate | 6+ | 24 | 66 |
| Jun 28, 18:00 | G4 Severe | 8 | 24 | 103 |
| Jul 1, 00:00 | G1 Minor | 5 | 3 | 17 |
| Jul 8, 06:00 | G5 Extreme | 9 | 45 | 200 |
| Jul 18, 06:00 | G1 Minor | 5+ | 12 | 34 |
| Jul 19, 06:00 | G1 Minor | 5 | 18 | 25 |
| Jul 21, 15:00 | G3 Strong | 7+ | 9 | 53 |
| Jul 22, 12:00 | G1 Minor | 5 | 3 | 20 |
| Jul 27, 06:00 | G1 Minor | 5 | 3 | 28 |
| Jul 31, 15:00 | G1 Minor | 5+ | 3 | 15 |
| Aug 17, 06:00 | G3 Strong | 7+ | 21 | 82 |
| Aug 22, 00:00 | G2 Moderate | 6- | 9 | 34 |
| Aug 24, 00:00 | G4 Severe | 8- | 15 | 85 |
| Aug 27, 03:00 | G3 Strong | 7- | 18 | 64 |
| Sep 3, 09:00 | G5 Extreme | 9- | 45 | 131 |
| Sep 5, 18:00 | G2 Moderate | 6- | 3 | 71 |
| Sep 8, 21:00 | G1 Minor | 5+ | 3 | 20 |
| Sep 16, 12:00 | G1 Minor | 5+ | 9 | 40 |
| Sep 25, 03:00 | G3 Strong | 7 | 27 | 82 |
| Oct 22, 03:00 | G2 Moderate | 6 | 33 | 47 |
| Oct 24, 03:00 | G3 Strong | 7 | 21 | 89 |
| Oct 27, 18:00 | G2 Moderate | 6+ | 21 | 37 |
| Nov 2, 15:00 | G1 Minor | 5+ | 3 | 16 |
| Nov 11, 00:00 | G1 Minor | 5 | 3 | 17 |
| Dec 2, 21:00 | G1 Minor | 5+ | 3 | 23 |
| Dec 4, 09:00 | G3 Strong | 7 | 18 | 54 |
| Dec 13, 00:00 | G2 Moderate | 6 | 24 | 50 |
| Dec 17, 18:00 | G3 Strong | 7 | 12 | 33 |
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.