Solar Cycle 17 - Top 50 geomagnetic storms

On this page you will find an overview of the strongest geomagnetic storms from Solar Cycle 17 together with links to more information in our archive. The Kp-values on this page are the official, finalized Kp-values from the GFZ in Potsdam, Germany. Times are in UTC.

		Ap	Kp max	00-03h	03-06h	06-09h	09-12h	12-15h	15-18h	18-21h	21-00h
1	1941/07/05	222	9	6+	6+	9-	9-	9	9-	7-	8-
2	1941/03/01	207	9	3	6+	8	8	9-	9	9-	7
3	1940/03/24	187	9	6+	6	5	4+	8	9	9	8+
4	1941/09/19	176	9	9-	9	9-	7+	4	5	7+	4
5	1938/04/16	136	9	3+	7	9	8	8-	6-	4+	5+
6	1941/09/18	232	9-	2	7-	8+	9-	9-	9-	9-	9-
7	1940/03/30	189	9-	9-	8+	8+	8	7+	8-	7	6-
8	1940/03/25	184	9-	9-	8+	8+	8	7	5-	7-	8
9	1938/01/25	107	9-	4	3-	2-	5-	6	7+	9-	8+
10	1938/05/11	103	9-	3-	3-	2	2+	2	8-	9-	9-
11	1939/04/24	79	9-	3+	2+	2	2+	1+	7	9-	7+
12	1943/08/31	140	8+	7	8+	7+	7+	8-	7	6+	5-
13	1938/01/22	128	8+	6-	7+	8+	8+	7-	7	5+	4+
14	1940/03/31	128	8+	7	5+	5-	8+	8	8-	6	6+
15	1940/06/25	126	8+	5-	7	5+	7+	8+	8-	7+	5+
16	1938/01/17	120	8+	7-	6+	7-	6+	8+	8-	5-	6+
17	1941/08/04	110	8+	5	7	6	6-	8+	7-	6+	7-
18	1940/03/29	100	8+	3-	2-	2+	5	5	8+	8	8+
19	1937/04/26	67	8+	6-	5-	3+	2+	2	5	7-	8+
20	1938/01/26	62	8+	8+	6+	4+	5-	4	4+	4	2
21	1939/04/17	135	8	6-	7+	8	7-	8-	7+	7-	6+
22	1937/04/28	128	8	7	8	8	7+	7-	7-	5	5+
23	1942/03/01	111	8	3+	3-	8	8	7+	6-	7-	7-
24	1940/04/03	98	8	8	8	7	5-	5-	5	6+	4-
25	1939/10/13	89	8	5	6-	6+	4	4-	6-	8-	8
26	1937/08/22	74	8	1+	6	8	8-	6-	3	4+	2+
27	1940/04/25	70	8	5-	8	4	2-	2+	5	7-	7-
28	1939/10/15	68	8	7-	8	7-	3+	3+	5-	4	3
29	1937/04/24	45	8	2-	2+	2	3-	4	5-	5+	8
30	1939/08/22	133	8-	8-	8-	5-	5	7+	7	7+	8-
31	1939/04/23	92	8-	4-	7	8-	6+	6+	7-	6	4-
32	1939/08/23	89	8-	8-	7+	7-	7-	6	4	4	4-
33	1939/08/12	88	8-	6	8-	7+	7-	5	4-	5-	6-
34	1941/03/30	85	8-	5	5	5+	4	5-	7	7+	8-
35	1941/12/01	83	8-	3	3	6-	7-	8-	7	5	6+
36	1941/11/01	79	8-	8-	7+	7	5-	5+	5+	3-	1
37	1940/05/24	78	8-	3	7	6-	8-	6+	5-	6-	4+
38	1941/03/31	76	8-	8-	7-	6-	7	5+	4	3+	3+
39	1937/10/04	71	8-	7	7+	8-	4	3+	4-	3	3+
40	1939/08/16	62	8-	1+	3-	3+	4-	7+	8-	5-	6-
41	1940/07/13	58	8-	1+	2-	3-	7-	8-	6	5-	4+
42	1938/09/28	56	8-	8-	7	5	4-	4	3+	3+	2
43	1943/08/09	48	8-	8-	6+	4+	3-	3	3	2+	4
44	1940/01/03	47	8-	2	4-	4-	3+	5+	8-	5	4
45	1940/09/26	44	8-	2-	0	0+	1-	1-	7-	8-	5
46	1938/01/16	34	8-	1+	2-	3-	2+	3+	4	3+	8-
47	1938/09/15	100	7+	6+	7-	7-	7-	7+	6+	6+	4+
48	1939/07/05	94	7+	5+	6+	6+	7-	7-	7+	6+	5-
49	1942/10/29	80	7+	5+	6-	7+	6	5+	5+	6+	6
50	1943/08/08	79	7+	3-	4+	3+	5+	7-	7+	6+	7+

Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future

Gillam, MB, Iqaluit, NU
Nuuk
Tórshavn
Sodankylä, Utsjoki
Reykjavik
Kirkenes, Tromsø
Murmansk
Kiruna

Latest news

Thursday, 11 September 2025

Coronal hole faces Earth

Sunday, 31 August 2025

M2.7 solar flare with earth-directed CME!

Tuesday, 5 August 2025

M4.4 solar flare from sunspot region 4168

More news

Latest forum messages

Unspecified geomagnetic activity 3203 CMEs from 2025/10/03 41 Incoming & Unnumbered Active Regions 2104 MODELO MAGNETOSFERA 3 AR 14232/ 14233/ 14236 146

Support SpaceWeatherLive.com!

A lot of people come to SpaceWeatherLive to follow the Solar activity or if there is a chance to see the aurora, but with more traffic comes higher costs to keep the servers online. If you like SpaceWeatherLive and want to support the project you can choose a subscription for an ad-free site or consider a donation. With your help we can keep SpaceWeatherLive online!