Top 50 geomagnetic storms of 2009

On this page you will find an overview of the strongest geomagnetic storms of 2009 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	Speed	IMF Bt	IMF Bz
1	2009/07/22	-83nT	24	6-	491.3km/sec	18.41nT	-17.83nT
2	2009/10/23	-47nT	10	4-	415.6km/sec	9.46nT	-6.37nT
3	2009/02/04	-42nT	14	4-	402.8km/sec	11.43nT	-9.68nT
4	2009/07/23	-40nT	7	2+	551.9km/sec	8.57nT	-5.86nT
5	2009/02/14	-38nT	17	4+	606.7km/sec	17.70nT	-15.00nT
6	2009/10/22	-38nT	13	4-	394.7km/sec	11.42nT	-9.13nT
7	2009/08/06	-36nT	10	4	520.7km/sec	14.76nT	-13.77nT
8	2009/10/30	-34nT	9	3+	385.9km/sec	8.06nT	-6.61nT
9	2009/03/13	-32nT	17	5-	583.1km/sec	16.24nT	-11.18nT
10	2009/01/26	-29nT	11	3+	388.1km/sec	11.14nT	-9.70nT
11	2009/10/25	-29nT	5	3	488.0km/sec	5.82nT	-3.38nT
12	2009/08/30	-29nT	20	6-	483.9km/sec	12.75nT	-11.64nT
13	2009/06/28	-28nT	10	4	444.4km/sec	12.20nT	-11.14nT
14	2009/02/05	-28nT	7	4-	394.4km/sec	8.21nT	-4.69nT
15	2009/06/29	-27nT	7	4-	565.9km/sec	9.54nT	-6.20nT
16	2009/03/21	-27nT	8	3	448.6km/sec	11.36nT	-9.63nT
17	2009/04/09	-27nT	12	3+	488.2km/sec	10.88nT	-7.20nT
18	2009/02/15	-26nT	10	4-	617.5km/sec	6.50nT	-5.22nT
19	2009/08/19	-26nT	8	3	465.1km/sec	12.15nT	-9.86nT
20	2009/05/08	-26nT	11	4	528.4km/sec	7.21nT	-5.24nT
21	2009/11/08	-26nT	7	3-	454.4km/sec	11.08nT	-8.70nT
22	2009/03/22	-25nT	5	3-	467.9km/sec	7.39nT	-3.49nT
23	2009/03/24	-25nT	7	3-	524.8km/sec	7.43nT	-6.92nT
24	2009/02/16	-25nT	4	2	522.5km/sec	4.70nT	-3.07nT
25	2009/11/26	-25nT	6	2+	440.7km/sec	7.86nT	-5.61nT
26	2009/04/18	-25nT	8	3+	545.5km/sec	7.47nT	-5.95nT
27	2009/07/24	-25nT	5	2	599.6km/sec	4.70nT	-3.32nT
28	2009/07/14	-25nT	8	4-	563.7km/sec	9.47nT	-9.16nT
29	2009/07/25	-24nT	4	2	543.0km/sec	4.57nT	-2.93nT
30	2009/03/15	-23nT	8	3	565.0km/sec	4.88nT	-3.88nT
31	2009/06/30	-23nT	4	2-	525.1km/sec	4.29nT	-3.88nT
32	2009/02/27	-23nT	11	4	701.0km/sec	10.27nT	-6.48nT
33	2009/08/31	-23nT	5	2+	464.4km/sec	6.49nT	-1.81nT
34	2009/10/24	-22nT	8	4	425.5km/sec	10.29nT	-7.91nT
35	2009/02/23	-22nT	5	3	483.3km/sec	7.57nT	-5.14nT
36	2009/09/21	-22nT	6	3	485.5km/sec	10.26nT	-8.25nT
37	2009/07/20	-22nT	4	2+	353.8km/sec	7.12nT	-6.60nT
38	2009/08/26	-21nT	3	2	388.9km/sec	6.43nT	-4.91nT
39	2009/06/05	-21nT	4	2-	336.0km/sec	5.76nT	-5.58nT
40	2009/03/25	-21nT	9	4-	515.9km/sec	4.81nT	-4.51nT
41	2009/02/17	-21nT	1	1	448.6km/sec	3.06nT	-2.57nT
42	2009/05/09	-21nT	5	2	530.9km/sec	6.04nT	-4.59nT
43	2009/03/14	-21nT	10	3	580.7km/sec	5.15nT	-3.89nT
44	2009/08/09	-21nT	6	2	475.4km/sec	5.27nT	-4.40nT
45	2009/02/06	-20nT	1	2	343.9km/sec	4.98nT	-3.62nT
46	2009/08/05	-20nT	5	2	405.5km/sec	12.94nT	-4.87nT
47	2009/04/13	-20nT	4	3-	455.3km/sec	4.56nT	-2.83nT
48	2009/05/14	-19nT	8	3	400.5km/sec	8.24nT	-7.69nT
49	2009/01/19	-19nT	9	4	498.0km/sec	12.85nT	-8.99nT
50	2009/01/14	-19nT	6	2+	368.8km/sec	9.22nT	-8.21nT

Latest news

Monday, 1 December 2025

X1.9 solar flare, Coronal hole faces Earth

Friday, 14 November 2025

X4.0 solar flare

Tuesday, 11 November 2025

X5.1 solar flare, G4 geomagnetic storm watch

More news

Latest forum messages

Unspecified geomagnetic activity 39 Space Weather Memes 760 AR4294 / 4296 / 4298 290 Current Farside Activity 233 AR 4299 23

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!

Space weather facts

Last X-flare	2025/12/01	X1.9
Last M-flare	2025/12/04	M6.0
Last geomagnetic storm	2025/12/04	Kp5 (G1)

Spotless days
Last spotless day	2022/06/08

Monthly mean Sunspot Number
October 2025	114.6 -15.2
December 2025	186 +71.4
Last 30 days	106.3 +12.6

This day in history*

Solar flares
1	2006	X12.9
2	2006	M2.63
3	2024	M2.5
4	2014	M2.22
5	2023	M1.5

		Dst	G
1	1958	-176	G3
2	1959	-166	G4
3	1989	-79	G1
4	1977	-72	G1
5	1982	-55

*since 1994

Social networks

SpaceWeatherLive