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
Tuesday, 5 August 2025
M4.4 solar flare from sunspot region 4168
Monday, 2 June 2025
The CME did not disappoint! More storming activity to come?
Saturday, 31 May 2025
M8.2 solar flare, Strong G4 geomagnetic storm watch
Latest forum messages
large-scale structure of coronal holes since Dec 2024 15Incoming & Unnumbered Active Regions 1997Perseids 2025 43Growth of Cycle 25 923Filaments and prominences 263
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Space weather facts
| Last X-flare | 2025/06/19 | X1.9 |
| Last M-flare | 2025/08/12 | M1.8 |
| Last geomagnetic storm | 2025/08/09 | Kp6 (G2) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| July 2025 | 125.6 +9.3 |
| August 2025 | 142.4 +16.8 |
| Last 30 days | 138.7 +31.9 |