Geomagnetic Storms of 2005
39 geomagnetic storms of G1 or more began in 2005: 18 G1, 7 G2, 6 G3, 7 G4, 1 G5. The strongest began August 24, 2005 and reached Kp 9-, rank 68 of every storm since 1932.
By month
Every storm of 2005
Times are UT, when the first block at Kp 5 or more began.
| Began (UTC) | Level | Peak Kp | Hours | Highest daily Ap |
|---|---|---|---|---|
| Jan 2, 15:00 | G2 Moderate | 6- | 9 | 37 |
| Jan 7, 12:00 | G4 Severe | 8- | 18 | 40 |
| Jan 12, 03:00 | G1 Minor | 5+ | 3 | 32 |
| Jan 14, 21:00 | G1 Minor | 5 | 3 | 16 |
| Jan 17, 00:00 | G4 Severe | 8- | 63 | 84 |
| Jan 21, 15:00 | G4 Severe | 8 | 15 | 66 |
| Feb 7, 18:00 | G2 Moderate | 6- | 12 | 32 |
| Feb 8, 18:00 | G1 Minor | 5 | 3 | 32 |
| Feb 18, 00:00 | G2 Moderate | 6+ | 3 | 32 |
| Mar 6, 00:00 | G1 Minor | 5+ | 3 | 37 |
| Mar 6, 15:00 | G2 Moderate | 6- | 39 | 40 |
| Mar 9, 18:00 | G1 Minor | 5 | 3 | 25 |
| Apr 4, 18:00 | G3 Strong | 7 | 15 | 50 |
| Apr 12, 00:00 | G1 Minor | 5 | 6 | 30 |
| Apr 13, 15:00 | G1 Minor | 5 | 3 | 31 |
| Apr 30, 00:00 | G1 Minor | 5 | 3 | 24 |
| May 8, 00:00 | G4 Severe | 8+ | 21 | 91 |
| May 15, 00:00 | G4 Severe | 8+ | 39 | 87 |
| May 20, 06:00 | G1 Minor | 5 | 3 | 23 |
| May 29, 21:00 | G4 Severe | 8- | 24 | 90 |
| Jun 4, 18:00 | G2 Moderate | 6- | 3 | 22 |
| Jun 12, 12:00 | G3 Strong | 7+ | 18 | 54 |
| Jun 16, 12:00 | G1 Minor | 5 | 6 | 26 |
| Jun 23, 03:00 | G3 Strong | 7 | 12 | 50 |
| Jul 9, 12:00 | G1 Minor | 5 | 3 | 24 |
| Jul 10, 09:00 | G2 Moderate | 6+ | 15 | 57 |
| Jul 11, 18:00 | G2 Moderate | 6+ | 21 | 40 |
| Jul 13, 06:00 | G1 Minor | 5+ | 9 | 31 |
| Jul 17, 09:00 | G1 Minor | 5+ | 24 | 25 |
| Jul 21, 00:00 | G1 Minor | 5 | 6 | 21 |
| Jul 27, 21:00 | G1 Minor | 5+ | 9 | 23 |
| Aug 24, 06:00 | G5 Extreme | 9- | 15 | 102 |
| Aug 25, 15:00 | G1 Minor | 5 | 3 | 22 |
| Aug 31, 12:00 | G3 Strong | 7 | 12 | 49 |
| Sep 2, 15:00 | G3 Strong | 7- | 15 | 39 |
| Sep 10, 15:00 | G4 Severe | 8- | 72 | 101 |
| Sep 15, 09:00 | G3 Strong | 7 | 12 | 52 |
| Oct 31, 18:00 | G1 Minor | 5 | 3 | 17 |
| Dec 27, 21:00 | G1 Minor | 5+ | 3 | 20 |
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.