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Top Solar Radiation Storms Help

On this page you will find an overview of the strongest solar radiation storms since 1976 together with links to more information in our archive.

S-scale Peak intensity
11991/03/23S4 - Severe43000
21989/10/19S4 - Severe40000
32003/10/29S4 - Severe33700
42001/11/06S4 - Severe31700
52001/11/05S4 - Severe24300
62000/07/15S4 - Severe24000
72001/11/24S4 - Severe18900
82000/11/09S4 - Severe14800
92001/09/25S4 - Severe12900
101994/02/20S4 - Severe10000
111989/08/12S3 - Strong9200
122000/07/14S3 - Strong8380
132003/10/28S3 - Strong7730
141989/11/30S3 - Strong7300
152001/09/26S3 - Strong7100
162012/03/08S3 - Strong6529.8
172012/01/24S3 - Strong6314.1
182005/01/17S3 - Strong5040
192001/11/23S3 - Strong4800
201982/05/09S3 - Strong4600
211989/09/29S3 - Strong4500
222000/11/10S3 - Strong4480
232003/10/30S3 - Strong3850
242012/01/23S3 - Strong3626.7
251989/03/08S3 - Strong3500
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Last X-flare2024/08/14X1.1
Last M-flare2024/09/09M3.4
Last geomagnetic storm2024/08/28Kp6- (G2)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
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September 2024168.8 -46.8
Last 30 days178.8 -43.6

This day in history*

Solar flares
12005X8.87
22005X5.17
32005X1.67
42001X1.36
52005M8.97
DstG
11992-131G3
22015-105G2
31973-79G4
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52011-72G2
*since 1994

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