Geomagnetic Storms of 1937
42 geomagnetic storms of G1 or more began in 1937: 14 G1, 16 G2, 7 G3, 5 G4, 0 G5. The strongest began April 26, 1937 and reached Kp 8+, rank 125 of every storm since 1932.
By month
Every storm of 1937
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 7, 18:00 | G2 Moderate | 6- | 3 | 18 |
| Feb 3, 00:00 | G3 Strong | 7- | 21 | 56 |
| Feb 19, 15:00 | G1 Minor | 5+ | 3 | 28 |
| Mar 1, 21:00 | G2 Moderate | 6- | 3 | 22 |
| Mar 5, 09:00 | G2 Moderate | 6- | 6 | 33 |
| Mar 13, 21:00 | G1 Minor | 5 | 9 | 20 |
| Mar 15, 12:00 | G2 Moderate | 6- | 3 | 24 |
| Mar 27, 12:00 | G1 Minor | 5 | 3 | 29 |
| Mar 31, 03:00 | G3 Strong | 7+ | 21 | 53 |
| Apr 2, 18:00 | G1 Minor | 5 | 12 | 25 |
| Apr 24, 18:00 | G4 Severe | 8 | 9 | 72 |
| Apr 25, 15:00 | G3 Strong | 7+ | 12 | 72 |
| Apr 26, 15:00 | G4 Severe | 8+ | 15 | 67 |
| Apr 27, 18:00 | G4 Severe | 8 | 30 | 128 |
| May 5, 00:00 | G3 Strong | 7 | 18 | 65 |
| May 27, 18:00 | G2 Moderate | 6- | 33 | 50 |
| Jun 5, 21:00 | G2 Moderate | 6- | 21 | 42 |
| Jun 13, 12:00 | G1 Minor | 5 | 3 | 19 |
| Jun 20, 18:00 | G1 Minor | 5 | 3 | 25 |
| Jun 27, 15:00 | G1 Minor | 5+ | 6 | 31 |
| Jul 9, 12:00 | G1 Minor | 5 | 15 | 15 |
| Jul 14, 12:00 | G1 Minor | 5+ | 9 | 31 |
| Jul 19, 18:00 | G2 Moderate | 6 | 12 | 21 |
| Jul 22, 06:00 | G2 Moderate | 6- | 6 | 35 |
| Jul 24, 00:00 | G2 Moderate | 6 | 6 | 34 |
| Aug 2, 03:00 | G2 Moderate | 6+ | 12 | 49 |
| Aug 3, 21:00 | G2 Moderate | 6+ | 6 | 26 |
| Aug 22, 03:00 | G4 Severe | 8 | 12 | 74 |
| Sep 10, 21:00 | G2 Moderate | 6 | 9 | 29 |
| Sep 30, 15:00 | G3 Strong | 7- | 18 | 36 |
| Oct 3, 21:00 | G4 Severe | 8- | 12 | 71 |
| Oct 8, 00:00 | G3 Strong | 7- | 9 | 38 |
| Oct 9, 12:00 | G2 Moderate | 6+ | 24 | 42 |
| Oct 11, 12:00 | G3 Strong | 7 | 9 | 46 |
| Oct 12, 09:00 | G1 Minor | 5+ | 15 | 30 |
| Oct 15, 18:00 | G1 Minor | 5 | 3 | 21 |
| Oct 23, 21:00 | G2 Moderate | 6+ | 6 | 34 |
| Oct 26, 03:00 | G1 Minor | 5 | 6 | 29 |
| Nov 22, 09:00 | G1 Minor | 5 | 3 | 23 |
| Nov 29, 18:00 | G2 Moderate | 6- | 3 | 27 |
| Nov 30, 18:00 | G1 Minor | 5+ | 9 | 30 |
| Dec 23, 12:00 | G2 Moderate | 6+ | 9 | 36 |
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.