Geomagnetic Storms of 1945
33 geomagnetic storms of G1 or more began in 1945: 12 G1, 16 G2, 5 G3, 0 G4, 0 G5. The strongest began March 27, 1945 and reached Kp 7+, rank 370 of every storm since 1932.
By month
Every storm of 1945
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 9, 21:00 | G2 Moderate | 6- | 6 | 25 |
| Jan 15, 15:00 | G2 Moderate | 6 | 6 | 36 |
| Jan 29, 00:00 | G3 Strong | 7 | 6 | 50 |
| Jan 29, 18:00 | G1 Minor | 5 | 3 | 50 |
| Feb 26, 15:00 | G1 Minor | 5+ | 6 | 23 |
| Mar 5, 18:00 | G1 Minor | 5+ | 3 | 20 |
| Mar 11, 00:00 | G1 Minor | 5 | 18 | 36 |
| Mar 12, 09:00 | G2 Moderate | 6+ | 15 | 51 |
| Mar 15, 00:00 | G3 Strong | 7- | 24 | 57 |
| Mar 20, 18:00 | G2 Moderate | 6 | 6 | 23 |
| Mar 26, 00:00 | G2 Moderate | 6 | 24 | 53 |
| Mar 27, 21:00 | G3 Strong | 7+ | 18 | 53 |
| Apr 1, 06:00 | G3 Strong | 7 | 21 | 54 |
| Apr 5, 18:00 | G2 Moderate | 6 | 3 | 19 |
| Apr 11, 09:00 | G2 Moderate | 6+ | 21 | 33 |
| Apr 14, 00:00 | G1 Minor | 5 | 3 | 23 |
| Jul 1, 00:00 | G2 Moderate | 6 | 15 | 43 |
| Jul 6, 06:00 | G2 Moderate | 6- | 6 | 27 |
| Jul 23, 21:00 | G1 Minor | 5+ | 3 | 13 |
| Jul 30, 03:00 | G1 Minor | 5 | 3 | 17 |
| Aug 2, 03:00 | G1 Minor | 5 | 3 | 18 |
| Aug 28, 00:00 | G2 Moderate | 6+ | 6 | 30 |
| Sep 17, 03:00 | G1 Minor | 5+ | 9 | 39 |
| Sep 18, 15:00 | G2 Moderate | 6+ | 12 | 43 |
| Oct 12, 09:00 | G1 Minor | 5+ | 9 | 30 |
| Oct 24, 09:00 | G2 Moderate | 6 | 30 | 52 |
| Oct 27, 21:00 | G2 Moderate | 6+ | 9 | 36 |
| Nov 9, 06:00 | G2 Moderate | 6+ | 12 | 44 |
| Dec 13, 21:00 | G3 Strong | 7- | 18 | 70 |
| Dec 19, 21:00 | G2 Moderate | 6 | 3 | 16 |
| Dec 21, 00:00 | G2 Moderate | 6- | 6 | 21 |
| Dec 25, 15:00 | G1 Minor | 5 | 3 | 21 |
| Dec 27, 18:00 | G1 Minor | 5+ | 3 | 27 |
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.