Geomagnetic Storms of 1984
71 geomagnetic storms of G1 or more began in 1984: 31 G1, 29 G2, 7 G3, 4 G4, 0 G5. The strongest began November 15, 1984 and reached Kp 8, rank 144 of every storm since 1932.
By month
Every storm of 1984
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 4, 06:00 | G2 Moderate | 6 | 3 | 30 |
| Jan 5, 00:00 | G1 Minor | 5+ | 6 | 26 |
| Jan 29, 00:00 | G1 Minor | 5 | 3 | 21 |
| Jan 31, 15:00 | G1 Minor | 5 | 3 | 23 |
| Feb 2, 18:00 | G2 Moderate | 6- | 9 | 20 |
| Feb 4, 00:00 | G2 Moderate | 6 | 24 | 54 |
| Feb 10, 18:00 | G2 Moderate | 6 | 9 | 21 |
| Feb 13, 00:00 | G1 Minor | 5+ | 3 | 36 |
| Feb 13, 18:00 | G2 Moderate | 6 | 12 | 43 |
| Feb 14, 21:00 | G2 Moderate | 6- | 6 | 43 |
| Feb 27, 00:00 | G2 Moderate | 6 | 6 | 34 |
| Mar 1, 18:00 | G2 Moderate | 6+ | 12 | 38 |
| Mar 3, 00:00 | G2 Moderate | 6- | 6 | 35 |
| Mar 6, 06:00 | G2 Moderate | 6- | 21 | 31 |
| Mar 8, 21:00 | G1 Minor | 5+ | 3 | 29 |
| Mar 13, 12:00 | G1 Minor | 5+ | 3 | 19 |
| Mar 18, 09:00 | G1 Minor | 5 | 3 | 18 |
| Mar 28, 12:00 | G3 Strong | 7+ | 21 | 60 |
| Mar 31, 21:00 | G1 Minor | 5+ | 15 | 34 |
| Apr 2, 06:00 | G2 Moderate | 6- | 24 | 46 |
| Apr 3, 18:00 | G4 Severe | 8- | 54 | 84 |
| Apr 7, 09:00 | G2 Moderate | 6 | 3 | 25 |
| Apr 8, 00:00 | G3 Strong | 7+ | 27 | 58 |
| Apr 14, 21:00 | G1 Minor | 5+ | 3 | 19 |
| Apr 20, 03:00 | G1 Minor | 5 | 3 | 20 |
| Apr 25, 12:00 | G4 Severe | 8- | 39 | 103 |
| May 5, 18:00 | G2 Moderate | 6- | 3 | 27 |
| May 9, 21:00 | G1 Minor | 5+ | 21 | 27 |
| May 17, 09:00 | G2 Moderate | 6 | 9 | 33 |
| May 19, 03:00 | G1 Minor | 5 | 3 | 22 |
| May 20, 15:00 | G2 Moderate | 6 | 60 | 45 |
| May 24, 12:00 | G1 Minor | 5+ | 6 | 30 |
| Jun 3, 12:00 | G2 Moderate | 6+ | 6 | 32 |
| Jun 15, 18:00 | G3 Strong | 7- | 15 | 42 |
| Jun 18, 12:00 | G2 Moderate | 6- | 3 | 27 |
| Jun 24, 00:00 | G2 Moderate | 6- | 6 | 22 |
| Jul 13, 06:00 | G3 Strong | 7 | 24 | 62 |
| Jul 17, 03:00 | G2 Moderate | 6 | 15 | 43 |
| Jul 31, 21:00 | G3 Strong | 7 | 33 | 75 |
| Aug 9, 21:00 | G1 Minor | 5 | 3 | 17 |
| Aug 25, 09:00 | G1 Minor | 5 | 3 | 18 |
| Aug 27, 15:00 | G2 Moderate | 6 | 18 | 36 |
| Sep 4, 06:00 | G4 Severe | 8- | 39 | 63 |
| Sep 10, 09:00 | G1 Minor | 5 | 3 | 25 |
| Sep 19, 09:00 | G2 Moderate | 6 | 12 | 36 |
| Sep 22, 18:00 | G3 Strong | 7 | 48 | 112 |
| Sep 25, 06:00 | G2 Moderate | 6- | 36 | 43 |
| Oct 3, 03:00 | G1 Minor | 5+ | 3 | 20 |
| Oct 6, 21:00 | G2 Moderate | 6 | 30 | 43 |
| Oct 10, 12:00 | G1 Minor | 5+ | 3 | 29 |
| Oct 11, 21:00 | G1 Minor | 5+ | 6 | 33 |
| Oct 12, 18:00 | G1 Minor | 5+ | 3 | 33 |
| Oct 18, 18:00 | G3 Strong | 7- | 51 | 75 |
| Oct 21, 15:00 | G2 Moderate | 6 | 30 | 47 |
| Oct 24, 06:00 | G1 Minor | 5+ | 9 | 39 |
| Oct 25, 21:00 | G2 Moderate | 6- | 6 | 22 |
| Nov 1, 06:00 | G2 Moderate | 6- | 6 | 27 |
| Nov 7, 15:00 | G1 Minor | 5 | 3 | 20 |
| Nov 10, 21:00 | G1 Minor | 5 | 3 | 18 |
| Nov 11, 21:00 | G1 Minor | 5 | 3 | 20 |
| Nov 15, 09:00 | G4 Severe | 8 | 42 | 112 |
| Nov 17, 15:00 | G1 Minor | 5 | 3 | 35 |
| Nov 29, 06:00 | G1 Minor | 5 | 3 | 13 |
| Nov 30, 03:00 | G2 Moderate | 6 | 6 | 36 |
| Dec 2, 03:00 | G1 Minor | 5 | 3 | 27 |
| Dec 4, 06:00 | G1 Minor | 5 | 3 | 28 |
| Dec 11, 21:00 | G1 Minor | 5+ | 6 | 19 |
| Dec 13, 03:00 | G2 Moderate | 6 | 3 | 27 |
| Dec 15, 18:00 | G2 Moderate | 6- | 6 | 24 |
| Dec 16, 18:00 | G1 Minor | 5+ | 6 | 33 |
| Dec 28, 06:00 | G1 Minor | 5+ | 3 | 31 |
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.