Geomagnetic Storms of 1966
26 geomagnetic storms of G1 or more began in 1966: 13 G1, 6 G2, 6 G3, 0 G4, 1 G5. The strongest began September 3, 1966 and reached Kp 9-, rank 51 of every storm since 1932.
By month
Every storm of 1966
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 21, 18:00 | G1 Minor | 5 | 3 | 23 |
| Jan 22, 12:00 | G1 Minor | 5+ | 3 | 27 |
| Feb 23, 03:00 | G1 Minor | 5 | 6 | 28 |
| Mar 13, 21:00 | G3 Strong | 7+ | 18 | 64 |
| Mar 23, 06:00 | G3 Strong | 7 | 15 | 67 |
| Mar 26, 12:00 | G2 Moderate | 6- | 3 | 20 |
| Mar 28, 15:00 | G3 Strong | 7 | 6 | 42 |
| Apr 1, 21:00 | G1 Minor | 5+ | 3 | 18 |
| May 26, 09:00 | G3 Strong | 7 | 15 | 78 |
| May 31, 06:00 | G2 Moderate | 6+ | 21 | 48 |
| Jun 24, 18:00 | G1 Minor | 5+ | 3 | 16 |
| Jul 8, 21:00 | G2 Moderate | 6 | 12 | 36 |
| Jul 10, 06:00 | G1 Minor | 5 | 6 | 25 |
| Aug 29, 21:00 | G3 Strong | 7+ | 30 | 82 |
| Sep 1, 09:00 | G1 Minor | 5 | 3 | 22 |
| Sep 3, 09:00 | G5 Extreme | 9- | 30 | 112 |
| Sep 8, 03:00 | G2 Moderate | 6- | 12 | 42 |
| Sep 28, 03:00 | G1 Minor | 5 | 3 | 20 |
| Oct 4, 18:00 | G2 Moderate | 6 | 18 | 36 |
| Oct 6, 03:00 | G1 Minor | 5+ | 3 | 22 |
| Oct 16, 06:00 | G2 Moderate | 6 | 9 | 33 |
| Nov 1, 15:00 | G1 Minor | 5 | 3 | 31 |
| Nov 28, 18:00 | G1 Minor | 5 | 9 | 19 |
| Nov 30, 06:00 | G1 Minor | 5+ | 3 | 28 |
| Dec 14, 12:00 | G3 Strong | 7 | 15 | 48 |
| Dec 27, 12:00 | G1 Minor | 5 | 3 | 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.