Geomagnetic Storms of 1956
62 geomagnetic storms of G1 or more began in 1956: 25 G1, 20 G2, 9 G3, 7 G4, 1 G5. The strongest began April 26, 1956 and reached Kp 9-, rank 39 of every storm since 1932.
By month
Every storm of 1956
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 4, 18:00 | G1 Minor | 5 | 3 | 17 |
| Jan 10, 15:00 | G2 Moderate | 6 | 30 | 42 |
| Jan 12, 18:00 | G2 Moderate | 6- | 3 | 21 |
| Jan 18, 00:00 | G1 Minor | 5+ | 6 | 40 |
| Jan 18, 21:00 | G2 Moderate | 6- | 18 | 40 |
| Jan 22, 00:00 | G2 Moderate | 6- | 6 | 29 |
| Jan 23, 21:00 | G1 Minor | 5 | 9 | 38 |
| Jan 24, 18:00 | G2 Moderate | 6- | 9 | 38 |
| Jan 27, 18:00 | G2 Moderate | 6+ | 12 | 37 |
| Feb 12, 00:00 | G1 Minor | 5+ | 9 | 28 |
| Feb 25, 03:00 | G4 Severe | 8+ | 18 | 103 |
| Feb 27, 18:00 | G1 Minor | 5+ | 12 | 24 |
| Feb 29, 00:00 | G1 Minor | 5+ | 18 | 41 |
| Mar 2, 03:00 | G1 Minor | 5 | 3 | 26 |
| Mar 3, 03:00 | G3 Strong | 7+ | 24 | 102 |
| Mar 10, 21:00 | G2 Moderate | 6 | 6 | 24 |
| Mar 21, 06:00 | G3 Strong | 7 | 27 | 60 |
| Mar 22, 21:00 | G2 Moderate | 6+ | 12 | 60 |
| Mar 24, 15:00 | G2 Moderate | 6 | 3 | 28 |
| Mar 28, 21:00 | G2 Moderate | 6+ | 12 | 38 |
| Apr 3, 03:00 | G1 Minor | 5+ | 3 | 20 |
| Apr 7, 00:00 | G1 Minor | 5+ | 3 | 21 |
| Apr 17, 00:00 | G1 Minor | 5 | 3 | 22 |
| Apr 21, 09:00 | G3 Strong | 7+ | 27 | 80 |
| Apr 26, 21:00 | G5 Extreme | 9- | 33 | 172 |
| Apr 28, 18:00 | G4 Severe | 8- | 18 | 65 |
| Apr 30, 00:00 | G2 Moderate | 6+ | 18 | 51 |
| May 12, 12:00 | G1 Minor | 5+ | 6 | 38 |
| May 13, 06:00 | G3 Strong | 7- | 6 | 35 |
| May 15, 12:00 | G4 Severe | 8+ | 51 | 156 |
| May 20, 09:00 | G2 Moderate | 6+ | 12 | 39 |
| May 23, 21:00 | G3 Strong | 7 | 39 | 95 |
| May 29, 18:00 | G2 Moderate | 6- | 3 | 19 |
| Jun 6, 12:00 | G1 Minor | 5 | 3 | 15 |
| Jun 9, 06:00 | G1 Minor | 5 | 3 | 17 |
| Jun 23, 21:00 | G3 Strong | 7- | 36 | 52 |
| Jul 14, 00:00 | G1 Minor | 5 | 3 | 13 |
| Jul 23, 21:00 | G2 Moderate | 6 | 15 | 24 |
| Jul 25, 09:00 | G1 Minor | 5 | 3 | 25 |
| Jul 26, 06:00 | G2 Moderate | 6- | 18 | 41 |
| Jul 29, 06:00 | G1 Minor | 5+ | 12 | 20 |
| Aug 11, 00:00 | G1 Minor | 5 | 3 | 33 |
| Aug 11, 18:00 | G1 Minor | 5+ | 3 | 33 |
| Aug 21, 12:00 | G2 Moderate | 6- | 3 | 24 |
| Aug 23, 12:00 | G4 Severe | 8- | 33 | 84 |
| Aug 25, 12:00 | G2 Moderate | 6+ | 21 | 35 |
| Aug 31, 09:00 | G1 Minor | 5+ | 3 | 21 |
| Sep 2, 00:00 | G4 Severe | 8 | 12 | 82 |
| Sep 3, 00:00 | G2 Moderate | 6+ | 15 | 48 |
| Sep 8, 09:00 | G4 Severe | 8+ | 12 | 78 |
| Sep 13, 03:00 | G1 Minor | 5+ | 3 | 17 |
| Sep 20, 15:00 | G2 Moderate | 6 | 18 | 35 |
| Sep 22, 03:00 | G1 Minor | 5+ | 9 | 35 |
| Oct 5, 06:00 | G1 Minor | 5+ | 3 | 17 |
| Oct 20, 06:00 | G1 Minor | 5+ | 24 | 36 |
| Oct 26, 18:00 | G3 Strong | 7- | 12 | 41 |
| Nov 9, 18:00 | G3 Strong | 7- | 81 | 72 |
| Nov 14, 03:00 | G4 Severe | 8- | 54 | 86 |
| Nov 22, 21:00 | G2 Moderate | 6- | 6 | 29 |
| Nov 25, 12:00 | G3 Strong | 7 | 3 | 29 |
| Nov 27, 21:00 | G1 Minor | 5+ | 6 | 17 |
| Dec 10, 03:00 | G1 Minor | 5 | 3 | 25 |
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.