Geomagnetic Storms of 1974

78 storms

78 geomagnetic storms of G1 or more began in 1974: 42 G1, 28 G2, 6 G3, 1 G4, 1 G5. The strongest began July 4, 1974 and reached Kp 9-, rank 43 of every storm since 1932.

By month

Every storm of 1974

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

Began (UTC)	Level	Peak Kp	Hours	Highest daily Ap
Jan 18, 06:00	G1 Minor	5	12	24
Jan 25, 03:00	G2 Moderate	6+	24	50
Jan 26, 18:00	G1 Minor	5+	9	38
Feb 11, 18:00	G2 Moderate	6-	21	40
Feb 22, 21:00	G2 Moderate	6	30	45
Feb 24, 18:00	G1 Minor	5	9	34
Feb 25, 15:00	G1 Minor	5	6	34
Feb 26, 09:00	G1 Minor	5	3	28
Feb 27, 21:00	G1 Minor	5	3	27
Mar 9, 03:00	G1 Minor	5+	30	33
Mar 11, 06:00	G1 Minor	5	12	32
Mar 16, 15:00	G3 Strong	7	6	42
Mar 20, 21:00	G3 Strong	7-	39	68
Mar 23, 00:00	G2 Moderate	6	18	42
Mar 24, 21:00	G1 Minor	5+	6	34
Mar 29, 12:00	G1 Minor	5	6	34
Apr 2, 21:00	G2 Moderate	6	45	39
Apr 6, 03:00	G2 Moderate	6-	3	26
Apr 7, 06:00	G1 Minor	5	3	18
Apr 10, 06:00	G1 Minor	5	3	28
Apr 11, 03:00	G1 Minor	5	3	19
Apr 18, 03:00	G2 Moderate	6+	39	48
Apr 20, 06:00	G2 Moderate	6-	27	46
Apr 23, 09:00	G1 Minor	5	3	29
Apr 26, 21:00	G1 Minor	5	3	21
Apr 28, 12:00	G1 Minor	5	3	23
May 3, 00:00	G2 Moderate	6-	6	24
May 4, 09:00	G1 Minor	5	6	34
May 5, 06:00	G1 Minor	5+	6	35
May 7, 12:00	G1 Minor	5	3	15
May 15, 12:00	G1 Minor	5+	3	30
May 17, 00:00	G2 Moderate	6-	15	38
May 22, 18:00	G1 Minor	5	3	23
May 23, 18:00	G2 Moderate	6-	30	39
May 31, 21:00	G2 Moderate	6	6	30
Jun 11, 18:00	G2 Moderate	6	18	33
Jun 15, 12:00	G2 Moderate	6-	12	37
Jun 25, 21:00	G1 Minor	5+	18	40
Jun 27, 03:00	G2 Moderate	6+	18	54
Jul 4, 00:00	G1 Minor	5	3	31
Jul 4, 15:00	G5 Extreme	9-	54	130
Jul 8, 12:00	G2 Moderate	6-	12	36
Jul 14, 03:00	G1 Minor	5+	3	23
Jul 23, 03:00	G3 Strong	7	42	82
Jul 26, 03:00	G1 Minor	5	3	20
Aug 2, 15:00	G1 Minor	5+	3	22
Aug 3, 15:00	G2 Moderate	6	12	35
Aug 19, 06:00	G2 Moderate	6	54	47
Aug 22, 00:00	G1 Minor	5	3	37
Aug 22, 18:00	G1 Minor	5+	18	37
Aug 24, 09:00	G1 Minor	5+	3	26
Aug 29, 09:00	G2 Moderate	6-	3	31
Sep 1, 03:00	G1 Minor	5	3	24
Sep 2, 21:00	G1 Minor	5+	3	32
Sep 4, 21:00	G1 Minor	5	3	20
Sep 15, 12:00	G4 Severe	8	27	88
Sep 18, 15:00	G2 Moderate	6-	18	34
Sep 20, 15:00	G2 Moderate	6-	3	35
Sep 21, 12:00	G2 Moderate	6+	12	43
Sep 24, 03:00	G1 Minor	5+	3	26
Sep 25, 18:00	G1 Minor	5+	18	38
Sep 27, 12:00	G1 Minor	5	3	25
Oct 1, 00:00	G1 Minor	5	3	28
Oct 2, 18:00	G2 Moderate	6	6	30
Oct 9, 03:00	G2 Moderate	6-	18	39
Oct 13, 00:00	G3 Strong	7	21	87
Oct 14, 15:00	G3 Strong	7	87	68
Oct 18, 18:00	G1 Minor	5+	3	43
Oct 20, 03:00	G2 Moderate	6-	15	41
Oct 24, 03:00	G2 Moderate	6+	6	38
Oct 26, 06:00	G1 Minor	5	3	28
Oct 27, 15:00	G1 Minor	5+	12	29
Oct 28, 21:00	G1 Minor	5	3	29
Nov 8, 18:00	G2 Moderate	6-	15	39
Nov 11, 12:00	G3 Strong	7	36	70
Nov 13, 21:00	G2 Moderate	6-	18	39
Nov 24, 21:00	G1 Minor	5	3	26
Dec 9, 03:00	G1 Minor	5+	18	42

1973 1975 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.