Solar Cycle 21 - Top 50 geomagnetic storms

On this page you will find an overview of the strongest geomagnetic storms from Solar Cycle 21 together with links to more information in our archive. Storms are ranked by the Disturbance storm-time index (Dst) that is designed to measure the magnetic signature of magnetospheric currents observed in the equatorial regions. The Dst index is provided by the World Data Center for geomagnetism in Kyoto.

		Dst	Ap	Kp max
1	1982/07/14	-325nT	153	9
2	1981/04/13	-311nT	121	8+
3	1986/02/09	-307nT	100	9-
4	1982/09/06	-289nT	199	9-
5	1986/02/08	-259nT	202	9
6	1980/12/19	-240nT	79	8-
7	1976/03/26	-226nT	145	8
8	1978/08/28	-226nT	124	8+
9	1981/07/25	-226nT	134	8+
10	1978/09/29	-224nT	109	8
11	1976/04/01	-218nT	118	8+
12	1981/03/05	-215nT	81	7+
13	1983/01/10	-213nT	78	8+
14	1982/03/02	-211nT	107	8
15	1982/09/22	-210nT	135	8+
16	1979/04/04	-202nT	47	7-
17	1981/07/26	-197nT	78	8
18	1982/11/24	-197nT	83	7+
19	1981/10/20	-192nT	67	7
20	1982/11/25	-192nT	54	7-
21	1982/09/07	-188nT	88	7+
22	1982/09/26	-187nT	84	7+
23	1981/10/22	-185nT	72	7
24	1983/02/05	-183nT	143	8
25	1982/07/13	-178nT	144	9
26	1983/02/04	-172nT	59	8-
27	1980/12/20	-171nT	21	4+
28	1979/04/03	-168nT	54	8
29	1983/03/02	-167nT	86	7
30	1981/04/12	-163nT	96	7
31	1977/10/28	-159nT	47	7+
32	1979/09/18	-158nT	64	7
33	1985/04/21	-158nT	103	8+
34	1982/03/01	-155nT	68	8
35	1982/08/07	-155nT	107	8-
36	1982/09/27	-155nT	42	7-
37	1978/05/04	-152nT	96	8-
38	1978/05/01	-150nT	88	8+
39	1978/11/25	-149nT	60	7
40	1979/04/25	-149nT	126	8
41	1981/10/23	-149nT	27	6-
42	1983/08/08	-149nT	62	8-
43	1985/11/29	-147nT	37	7-
44	1978/05/02	-145nT	94	7+
45	1984/11/16	-141nT	112	8
46	1979/03/10	-140nT	54	7
47	1979/08/29	-140nT	77	8-
48	1981/05/11	-137nT	61	7-
49	1982/04/10	-137nT	61	7
50	1981/03/06	-136nT	11	3+

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
Reykjavik

The solar wind speed is currently moderately high (544 km/sec.)

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Last X-flare	2025/06/19	X1.9
Last M-flare	2025/09/19	M1.5
Last geomagnetic storm	2025/09/16	Kp5 (G1)

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August 2025	133.5 +7.9
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Last 30 days	133.6 +12

This day in history*

Solar flares
1	1998	M9.96
2	2014	M3.32
3	2011	M2.85
4	2021	M2.8
5	2011	M2.37

		Dst	G
1	1957	-303	G4
2	1963	-236	G4
3	1999	-155	G2
4	1982	-87	G1
5	1959	-76	G1

*since 1994