Geomagnetic Storms of 1970
34 geomagnetic storms of G1 or more began in 1970: 15 G1, 10 G2, 4 G3, 3 G4, 2 G5. The strongest began March 7, 1970 and reached Kp 9, rank 21 of every storm since 1932.
By month
Every storm of 1970
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 2, 06:00 | G1 Minor | 5+ | 3 | 30 |
| Mar 6, 21:00 | G2 Moderate | 6- | 6 | 42 |
| Mar 7, 18:00 | G5 Extreme | 9 | 48 | 149 |
| Mar 31, 06:00 | G2 Moderate | 6+ | 12 | 51 |
| Apr 6, 06:00 | G1 Minor | 5 | 6 | 23 |
| Apr 17, 00:00 | G1 Minor | 5+ | 3 | 29 |
| Apr 18, 12:00 | G1 Minor | 5+ | 3 | 18 |
| Apr 19, 06:00 | G1 Minor | 5 | 3 | 21 |
| Apr 21, 06:00 | G4 Severe | 8+ | 27 | 90 |
| May 27, 21:00 | G3 Strong | 7 | 18 | 45 |
| Jun 1, 03:00 | G1 Minor | 5+ | 9 | 28 |
| Jun 18, 12:00 | G1 Minor | 5+ | 3 | 27 |
| Jun 27, 06:00 | G2 Moderate | 6 | 9 | 35 |
| Jul 3, 21:00 | G2 Moderate | 6+ | 12 | 26 |
| Jul 8, 21:00 | G3 Strong | 7+ | 30 | 87 |
| Jul 10, 15:00 | G1 Minor | 5 | 6 | 34 |
| Jul 21, 12:00 | G2 Moderate | 6- | 9 | 30 |
| Jul 24, 21:00 | G4 Severe | 8- | 30 | 92 |
| Jul 29, 03:00 | G2 Moderate | 6 | 15 | 45 |
| Aug 8, 09:00 | G1 Minor | 5 | 3 | 26 |
| Aug 9, 00:00 | G1 Minor | 5+ | 3 | 19 |
| Aug 16, 21:00 | G5 Extreme | 9- | 27 | 115 |
| Aug 18, 15:00 | G2 Moderate | 6- | 3 | 36 |
| Sep 1, 09:00 | G1 Minor | 5 | 3 | 23 |
| Sep 2, 09:00 | G1 Minor | 5 | 3 | 18 |
| Oct 4, 03:00 | G2 Moderate | 6- | 3 | 25 |
| Oct 12, 03:00 | G1 Minor | 5+ | 3 | 16 |
| Oct 16, 09:00 | G2 Moderate | 6 | 12 | 37 |
| Oct 17, 15:00 | G3 Strong | 7- | 15 | 39 |
| Oct 23, 15:00 | G1 Minor | 5 | 3 | 29 |
| Nov 7, 00:00 | G3 Strong | 7- | 15 | 58 |
| Nov 18, 21:00 | G1 Minor | 5+ | 9 | 18 |
| Nov 21, 06:00 | G2 Moderate | 6- | 9 | 30 |
| Dec 14, 03:00 | G4 Severe | 8+ | 21 | 65 |
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.