Geomagnetic Storms of 1975
54 geomagnetic storms of G1 or more began in 1975: 30 G1, 19 G2, 4 G3, 1 G4, 0 G5. The strongest began January 6, 1975 and reached Kp 8-, rank 276 of every storm since 1932.
By month
Every storm of 1975
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 4, 15:00 | G1 Minor | 5 | 3 | 32 |
| Jan 6, 21:00 | G4 Severe | 8- | 12 | 44 |
| Jan 8, 06:00 | G1 Minor | 5+ | 15 | 36 |
| Jan 13, 03:00 | G1 Minor | 5 | 3 | 32 |
| Jan 14, 03:00 | G1 Minor | 5 | 12 | 33 |
| Jan 17, 06:00 | G1 Minor | 5 | 3 | 29 |
| Feb 1, 03:00 | G1 Minor | 5 | 12 | 37 |
| Feb 10, 03:00 | G1 Minor | 5 | 3 | 38 |
| Feb 10, 21:00 | G2 Moderate | 6- | 6 | 38 |
| Feb 11, 15:00 | G1 Minor | 5 | 9 | 36 |
| Feb 13, 18:00 | G1 Minor | 5 | 3 | 27 |
| Feb 16, 15:00 | G1 Minor | 5 | 3 | 30 |
| Feb 23, 09:00 | G2 Moderate | 6 | 6 | 32 |
| Mar 5, 09:00 | G1 Minor | 5 | 3 | 30 |
| Mar 10, 00:00 | G3 Strong | 7 | 33 | 80 |
| Mar 11, 21:00 | G1 Minor | 5+ | 9 | 53 |
| Mar 12, 18:00 | G1 Minor | 5+ | 6 | 37 |
| Mar 13, 18:00 | G2 Moderate | 6 | 3 | 29 |
| Mar 14, 21:00 | G2 Moderate | 6- | 3 | 29 |
| Mar 16, 06:00 | G1 Minor | 5+ | 6 | 27 |
| Mar 27, 15:00 | G2 Moderate | 6+ | 24 | 38 |
| Apr 6, 21:00 | G1 Minor | 5 | 3 | 15 |
| Apr 7, 18:00 | G2 Moderate | 6- | 6 | 25 |
| Apr 8, 15:00 | G2 Moderate | 6 | 39 | 52 |
| Apr 10, 21:00 | G1 Minor | 5+ | 18 | 35 |
| Apr 12, 09:00 | G2 Moderate | 6- | 24 | 29 |
| Apr 20, 18:00 | G2 Moderate | 6 | 9 | 25 |
| May 5, 00:00 | G2 Moderate | 6- | 3 | 34 |
| May 5, 21:00 | G2 Moderate | 6 | 9 | 35 |
| May 10, 00:00 | G1 Minor | 5 | 3 | 19 |
| May 16, 06:00 | G2 Moderate | 6- | 3 | 28 |
| May 19, 18:00 | G1 Minor | 5 | 15 | 23 |
| May 26, 00:00 | G1 Minor | 5 | 3 | 18 |
| Jun 1, 18:00 | G2 Moderate | 6- | 12 | 28 |
| Jun 12, 12:00 | G1 Minor | 5 | 3 | 27 |
| Jun 29, 15:00 | G2 Moderate | 6- | 12 | 26 |
| Jul 8, 03:00 | G2 Moderate | 6 | 12 | 37 |
| Jul 9, 09:00 | G3 Strong | 7- | 6 | 35 |
| Jul 11, 06:00 | G1 Minor | 5 | 3 | 19 |
| Jul 25, 06:00 | G2 Moderate | 6 | 3 | 33 |
| Aug 29, 03:00 | G1 Minor | 5+ | 3 | 27 |
| Sep 9, 12:00 | G1 Minor | 5 | 3 | 24 |
| Sep 10, 03:00 | G1 Minor | 5+ | 3 | 26 |
| Oct 7, 03:00 | G1 Minor | 5+ | 6 | 38 |
| Oct 7, 21:00 | G1 Minor | 5+ | 3 | 38 |
| Oct 8, 21:00 | G3 Strong | 7- | 15 | 45 |
| Oct 10, 03:00 | G1 Minor | 5 | 6 | 25 |
| Oct 31, 06:00 | G1 Minor | 5+ | 3 | 19 |
| Nov 2, 18:00 | G3 Strong | 7- | 45 | 65 |
| Nov 9, 15:00 | G2 Moderate | 6+ | 6 | 37 |
| Nov 10, 21:00 | G2 Moderate | 6- | 3 | 20 |
| Nov 22, 06:00 | G2 Moderate | 6+ | 15 | 50 |
| Nov 29, 09:00 | G1 Minor | 5 | 30 | 36 |
| Dec 26, 15:00 | G1 Minor | 5+ | 30 | 34 |
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.