Geomagnetic Storms of 2004

26 storms

26 geomagnetic storms of G1 or more began in 2004: 10 G1, 10 G2, 3 G3, 1 G4, 2 G5. The strongest began November 7, 2004 and reached Kp 9-, rank 26 of every storm since 1932.

By month

Every storm of 2004

Times are UT, when the first block at Kp 5 or more began.

Began (UTC)	Level	Peak Kp	Hours	Highest daily Ap
Jan 6, 21:00	G2 Moderate	6	12	29
Jan 9, 06:00	G1 Minor	5	3	23
Jan 10, 06:00	G1 Minor	5+	3	26
Jan 22, 00:00	G3 Strong	7	21	64
Jan 23, 15:00	G2 Moderate	6	12	43
Jan 25, 00:00	G2 Moderate	6-	6	38
Jan 28, 00:00	G2 Moderate	6-	3	23
Feb 11, 15:00	G2 Moderate	6+	18	30
Feb 29, 09:00	G1 Minor	5+	3	24
Mar 9, 15:00	G2 Moderate	6+	18	45
Mar 10, 21:00	G1 Minor	5	3	45
Mar 11, 15:00	G2 Moderate	6+	12	40
Mar 27, 21:00	G1 Minor	5+	9	22
Apr 3, 15:00	G2 Moderate	6+	12	41
Apr 5, 18:00	G2 Moderate	6+	9	25
Jul 11, 21:00	G1 Minor	5	3	18
Jul 17, 00:00	G2 Moderate	6	3	21
Jul 22, 18:00	G3 Strong	7	24	52
Jul 24, 12:00	G4 Severe	8	39	154
Jul 26, 21:00	G5 Extreme	9-	27	186
Aug 30, 15:00	G3 Strong	7	18	42
Sep 14, 18:00	G1 Minor	5+	3	32
Sep 18, 03:00	G1 Minor	5	3	15
Oct 13, 03:00	G1 Minor	5	12	33
Nov 7, 18:00	G5 Extreme	9-	84	161
Dec 12, 15:00	G1 Minor	5+	3	28

2003 2005 The strongest on record Tonight’s aurora forecast

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.