Geomagnetic Storms of 1943

76 storms

76 geomagnetic storms of G1 or more began in 1943: 34 G1, 33 G2, 7 G3, 2 G4, 0 G5. The strongest began August 29, 1943 and reached Kp 8+, rank 81 of every storm since 1932.

By month

Every storm of 1943

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

Began (UTC)	Level	Peak Kp	Hours	Highest daily Ap
Jan 4, 09:00	G1 Minor	5+	9	30
Jan 17, 09:00	G1 Minor	5+	3	25
Jan 20, 15:00	G3 Strong	7-	9	40
Jan 22, 00:00	G2 Moderate	6-	3	28
Feb 17, 06:00	G3 Strong	7-	6	41
Feb 26, 00:00	G1 Minor	5	6	24
Mar 2, 06:00	G1 Minor	5+	3	16
Mar 11, 18:00	G1 Minor	5	3	15
Mar 16, 09:00	G2 Moderate	6-	3	28
Mar 20, 06:00	G2 Moderate	6-	15	27
Mar 23, 00:00	G1 Minor	5+	6	29
Mar 29, 18:00	G3 Strong	7	9	38
Apr 3, 00:00	G2 Moderate	6-	6	37
Apr 5, 00:00	G1 Minor	5	3	27
Apr 5, 15:00	G2 Moderate	6-	3	27
Apr 6, 12:00	G1 Minor	5+	15	27
Apr 11, 00:00	G2 Moderate	6+	9	39
Apr 26, 00:00	G2 Moderate	6	9	35
Apr 30, 09:00	G1 Minor	5	3	20
May 1, 03:00	G2 Moderate	6+	24	61
May 15, 00:00	G2 Moderate	6-	6	27
May 17, 18:00	G2 Moderate	6-	15	38
May 19, 03:00	G1 Minor	5	3	19
May 24, 00:00	G2 Moderate	6	3	29
May 28, 00:00	G1 Minor	5	3	28
Jun 13, 00:00	G2 Moderate	6-	3	23
Jun 20, 00:00	G1 Minor	5+	3	23
Jul 4, 18:00	G2 Moderate	6-	42	47
Jul 9, 06:00	G2 Moderate	6-	15	33
Aug 3, 00:00	G2 Moderate	6-	3	29
Aug 7, 09:00	G2 Moderate	6-	3	19
Aug 8, 09:00	G4 Severe	8-	21	79
Aug 13, 03:00	G2 Moderate	6	21	52
Aug 14, 18:00	G1 Minor	5	3	28
Aug 16, 06:00	G1 Minor	5+	6	27
Aug 17, 00:00	G1 Minor	5+	9	28
Aug 18, 06:00	G2 Moderate	6+	9	35
Aug 19, 09:00	G2 Moderate	6-	27	37
Aug 24, 03:00	G1 Minor	5+	6	23
Aug 26, 06:00	G1 Minor	5	3	18
Aug 28, 12:00	G3 Strong	7	12	43
Aug 29, 12:00	G4 Severe	8+	63	140
Sep 1, 15:00	G1 Minor	5	3	36
Sep 2, 12:00	G1 Minor	5+	3	34
Sep 3, 03:00	G2 Moderate	6-	30	48
Sep 8, 18:00	G2 Moderate	6	9	38
Sep 9, 21:00	G1 Minor	5+	15	38
Sep 13, 03:00	G1 Minor	5	3	28
Sep 26, 12:00	G2 Moderate	6	6	38
Sep 27, 18:00	G3 Strong	7	105	67
Oct 2, 15:00	G2 Moderate	6-	33	44
Oct 8, 09:00	G2 Moderate	6+	36	46
Oct 10, 15:00	G2 Moderate	6-	3	21
Oct 20, 18:00	G1 Minor	5+	3	15
Oct 22, 09:00	G1 Minor	5	3	24
Oct 24, 09:00	G3 Strong	7-	24	42
Oct 26, 00:00	G2 Moderate	6-	15	50
Oct 27, 06:00	G2 Moderate	6	36	44
Oct 29, 12:00	G1 Minor	5+	9	40
Oct 30, 12:00	G1 Minor	5	3	33
Oct 31, 03:00	G1 Minor	5+	18	37
Nov 1, 12:00	G1 Minor	5	3	28
Nov 6, 15:00	G2 Moderate	6	3	29
Nov 19, 06:00	G3 Strong	7-	45	57
Nov 21, 15:00	G1 Minor	5	3	39
Nov 22, 15:00	G1 Minor	5	3	25
Nov 23, 15:00	G2 Moderate	6	30	44
Nov 25, 12:00	G2 Moderate	6	12	44
Nov 26, 12:00	G2 Moderate	6+	21	44
Nov 28, 09:00	G1 Minor	5	3	24
Nov 29, 03:00	G1 Minor	5	3	27
Dec 2, 18:00	G1 Minor	5+	3	20
Dec 5, 03:00	G1 Minor	5	3	17
Dec 16, 06:00	G2 Moderate	6-	30	38
Dec 19, 15:00	G2 Moderate	6	6	40
Dec 21, 18:00	G1 Minor	5	6	24

1942 1944 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.