Solar Cycle 23 - Top Solar Radiation Storms Help
On this page you will find an overview of the strongest solar radiation storms from Solar Cycle 23 together with links to more information in our archive.
Latest news
Monday, 30 March 2026
X1.5 solar flare
Tuesday, 17 March 2026
M2.7 solar flare, CME arrival possible
Sunday, 1 February 2026
Complex sunspot region 4366
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Space weather facts
| Last X-flare | 2026/04/24 | X2.5 |
| Last M-flare | 2026/05/10 | M5.7 |
| Last geomagnetic storm | 2026/05/05 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2026 | 79.3 -6.6 |
| May 2026 | 112.3 +33 |
| Last 30 days | 94.3 -3.8 |
