Geomagnetic Storms of 1949
54 geomagnetic storms of G1 or more began in 1949: 27 G1, 12 G2, 11 G3, 2 G4, 2 G5. The strongest began January 24, 1949 and reached Kp 9-, rank 32 of every storm since 1932.
By month
Every storm of 1949
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 2, 00:00 | G3 Strong | 7- | 15 | 45 |
| Jan 10, 21:00 | G1 Minor | 5 | 3 | 17 |
| Jan 13, 00:00 | G1 Minor | 5 | 3 | 16 |
| Jan 24, 18:00 | G5 Extreme | 9- | 48 | 156 |
| Feb 4, 00:00 | G2 Moderate | 6+ | 6 | 32 |
| Feb 7, 00:00 | G1 Minor | 5+ | 6 | 23 |
| Feb 17, 12:00 | G1 Minor | 5+ | 3 | 28 |
| Feb 21, 15:00 | G2 Moderate | 6+ | 18 | 46 |
| Feb 24, 00:00 | G1 Minor | 5 | 3 | 25 |
| Feb 27, 06:00 | G1 Minor | 5+ | 3 | 18 |
| Mar 3, 15:00 | G1 Minor | 5 | 3 | 22 |
| Mar 9, 15:00 | G1 Minor | 5+ | 3 | 22 |
| Mar 14, 00:00 | G1 Minor | 5+ | 12 | 38 |
| Mar 16, 15:00 | G3 Strong | 7+ | 6 | 36 |
| Mar 17, 18:00 | G3 Strong | 7- | 9 | 37 |
| Mar 21, 21:00 | G4 Severe | 8- | 39 | 91 |
| Apr 7, 18:00 | G3 Strong | 7+ | 27 | 83 |
| Apr 10, 18:00 | G1 Minor | 5+ | 6 | 32 |
| Apr 11, 12:00 | G1 Minor | 5+ | 6 | 29 |
| Apr 12, 15:00 | G2 Moderate | 6 | 15 | 28 |
| Apr 29, 15:00 | G1 Minor | 5+ | 3 | 16 |
| May 3, 21:00 | G3 Strong | 7 | 9 | 31 |
| May 5, 21:00 | G1 Minor | 5 | 3 | 18 |
| May 12, 06:00 | G5 Extreme | 9- | 33 | 153 |
| May 30, 18:00 | G3 Strong | 7- | 12 | 36 |
| Jun 3, 21:00 | G3 Strong | 7- | 57 | 59 |
| Jun 6, 21:00 | G2 Moderate | 6 | 3 | 27 |
| Jun 12, 12:00 | G2 Moderate | 6 | 15 | 34 |
| Jul 12, 18:00 | G1 Minor | 5 | 3 | 10 |
| Jul 16, 18:00 | G1 Minor | 5 | 3 | 19 |
| Aug 2, 12:00 | G3 Strong | 7 | 24 | 58 |
| Aug 4, 00:00 | G3 Strong | 7- | 21 | 64 |
| Aug 8, 00:00 | G3 Strong | 7- | 6 | 34 |
| Aug 14, 00:00 | G1 Minor | 5+ | 3 | 33 |
| Aug 14, 21:00 | G1 Minor | 5+ | 9 | 33 |
| Sep 3, 03:00 | G2 Moderate | 6 | 6 | 38 |
| Sep 12, 06:00 | G2 Moderate | 6- | 9 | 28 |
| Sep 14, 12:00 | G1 Minor | 5+ | 3 | 17 |
| Sep 24, 21:00 | G1 Minor | 5+ | 3 | 14 |
| Sep 25, 18:00 | G1 Minor | 5 | 3 | 32 |
| Oct 7, 03:00 | G3 Strong | 7+ | 48 | 65 |
| Oct 13, 18:00 | G4 Severe | 8+ | 72 | 156 |
| Oct 22, 21:00 | G2 Moderate | 6- | 3 | 16 |
| Oct 24, 00:00 | G1 Minor | 5 | 6 | 19 |
| Oct 27, 18:00 | G2 Moderate | 6 | 12 | 35 |
| Nov 1, 12:00 | G2 Moderate | 6 | 9 | 33 |
| Nov 2, 21:00 | G2 Moderate | 6- | 6 | 34 |
| Nov 11, 03:00 | G1 Minor | 5+ | 3 | 26 |
| Nov 16, 00:00 | G1 Minor | 5 | 3 | 13 |
| Nov 19, 18:00 | G2 Moderate | 6+ | 15 | 42 |
| Nov 21, 18:00 | G1 Minor | 5 | 3 | 16 |
| Nov 29, 00:00 | G1 Minor | 5+ | 3 | 31 |
| Nov 30, 09:00 | G1 Minor | 5+ | 9 | 38 |
| Dec 9, 06:00 | G1 Minor | 5+ | 3 | 24 |
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.