Geomagnetic Storms of 1955
36 geomagnetic storms of G1 or more began in 1955: 19 G1, 12 G2, 2 G3, 3 G4, 0 G5. The strongest began November 19, 1955 and reached Kp 8-, rank 233 of every storm since 1932.
By month
Every storm of 1955
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 11, 21:00 | G1 Minor | 5 | 6 | 16 |
| Jan 17, 12:00 | G4 Severe | 8- | 21 | 59 |
| Jan 19, 00:00 | G2 Moderate | 6+ | 12 | 53 |
| Feb 28, 00:00 | G2 Moderate | 6 | 15 | 33 |
| Mar 7, 18:00 | G2 Moderate | 6 | 3 | 30 |
| Mar 9, 18:00 | G1 Minor | 5 | 3 | 23 |
| Mar 22, 09:00 | G2 Moderate | 6+ | 9 | 35 |
| Mar 23, 18:00 | G1 Minor | 5+ | 6 | 21 |
| Mar 30, 21:00 | G2 Moderate | 6+ | 15 | 53 |
| Apr 1, 21:00 | G1 Minor | 5 | 3 | 16 |
| Apr 24, 12:00 | G1 Minor | 5 | 3 | 19 |
| Apr 27, 18:00 | G4 Severe | 8- | 9 | 54 |
| Apr 28, 21:00 | G2 Moderate | 6- | 6 | 44 |
| May 6, 12:00 | G2 Moderate | 6 | 12 | 32 |
| May 8, 03:00 | G1 Minor | 5+ | 3 | 32 |
| May 16, 03:00 | G1 Minor | 5+ | 3 | 14 |
| May 25, 18:00 | G3 Strong | 7- | 18 | 39 |
| May 27, 18:00 | G1 Minor | 5 | 3 | 21 |
| Jun 8, 03:00 | G1 Minor | 5 | 3 | 23 |
| Jul 2, 18:00 | G1 Minor | 5+ | 3 | 19 |
| Jul 12, 00:00 | G1 Minor | 5+ | 3 | 20 |
| Aug 4, 09:00 | G1 Minor | 5+ | 6 | 31 |
| Aug 6, 06:00 | G1 Minor | 5+ | 18 | 34 |
| Aug 28, 06:00 | G2 Moderate | 6 | 3 | 20 |
| Sep 3, 09:00 | G1 Minor | 5 | 3 | 17 |
| Sep 29, 15:00 | G3 Strong | 7- | 24 | 54 |
| Oct 5, 18:00 | G2 Moderate | 6- | 3 | 23 |
| Oct 25, 06:00 | G2 Moderate | 6 | 24 | 56 |
| Oct 26, 18:00 | G2 Moderate | 6- | 3 | 38 |
| Oct 31, 18:00 | G1 Minor | 5+ | 6 | 26 |
| Nov 4, 03:00 | G1 Minor | 5 | 6 | 24 |
| Nov 17, 03:00 | G1 Minor | 5 | 3 | 11 |
| Nov 18, 15:00 | G2 Moderate | 6- | 6 | 30 |
| Nov 19, 09:00 | G4 Severe | 8- | 33 | 65 |
| Dec 1, 18:00 | G1 Minor | 5+ | 3 | 23 |
| Dec 26, 21:00 | G1 Minor | 5 | 3 | 18 |
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.