Geomagnetic Storms of 1971
38 geomagnetic storms of G1 or more began in 1971: 20 G1, 14 G2, 3 G3, 1 G4, 0 G5. The strongest began April 14, 1971 and reached Kp 8-, rank 283 of every storm since 1932.
By month
Every storm of 1971
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 3, 18:00 | G1 Minor | 5+ | 3 | 33 |
| Jan 20, 03:00 | G1 Minor | 5+ | 3 | 29 |
| Jan 27, 06:00 | G2 Moderate | 6 | 12 | 37 |
| Jan 28, 15:00 | G2 Moderate | 6 | 12 | 39 |
| Jan 30, 03:00 | G1 Minor | 5 | 9 | 26 |
| Feb 15, 15:00 | G2 Moderate | 6 | 12 | 29 |
| Feb 24, 21:00 | G2 Moderate | 6+ | 33 | 43 |
| Mar 12, 21:00 | G2 Moderate | 6 | 24 | 39 |
| Mar 14, 09:00 | G1 Minor | 5 | 18 | 29 |
| Apr 4, 00:00 | G1 Minor | 5+ | 3 | 27 |
| Apr 9, 06:00 | G2 Moderate | 6 | 24 | 53 |
| Apr 11, 03:00 | G1 Minor | 5 | 3 | 27 |
| Apr 14, 21:00 | G4 Severe | 8- | 6 | 39 |
| Apr 21, 21:00 | G2 Moderate | 6+ | 3 | 22 |
| Apr 28, 12:00 | G1 Minor | 5 | 6 | 21 |
| May 6, 09:00 | G2 Moderate | 6+ | 21 | 50 |
| May 17, 00:00 | G3 Strong | 7- | 30 | 73 |
| May 30, 12:00 | G1 Minor | 5 | 3 | 19 |
| Jun 2, 18:00 | G1 Minor | 5+ | 9 | 31 |
| Jun 25, 12:00 | G1 Minor | 5+ | 12 | 32 |
| Jun 29, 18:00 | G1 Minor | 5 | 3 | 23 |
| Jul 21, 15:00 | G1 Minor | 5+ | 3 | 21 |
| Jul 26, 18:00 | G2 Moderate | 6- | 3 | 17 |
| Aug 17, 21:00 | G1 Minor | 5+ | 3 | 11 |
| Aug 31, 00:00 | G1 Minor | 5 | 3 | 32 |
| Aug 31, 21:00 | G1 Minor | 5 | 3 | 32 |
| Sep 17, 21:00 | G3 Strong | 7- | 15 | 47 |
| Sep 25, 03:00 | G2 Moderate | 6- | 3 | 27 |
| Sep 26, 21:00 | G2 Moderate | 6+ | 9 | 39 |
| Oct 3, 00:00 | G1 Minor | 5 | 3 | 20 |
| Oct 6, 15:00 | G1 Minor | 5 | 3 | 20 |
| Oct 7, 18:00 | G1 Minor | 5+ | 12 | 23 |
| Oct 9, 03:00 | G2 Moderate | 6 | 6 | 37 |
| Oct 29, 00:00 | G1 Minor | 5 | 3 | 27 |
| Nov 22, 21:00 | G2 Moderate | 6 | 12 | 45 |
| Nov 23, 21:00 | G1 Minor | 5+ | 18 | 45 |
| Nov 25, 03:00 | G2 Moderate | 6 | 9 | 43 |
| Dec 17, 00:00 | G3 Strong | 7+ | 36 | 67 |
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.