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Bulletin on solar and geomagnetic activity Solar activity report
Geophysical report
Sunspot regions
Coronal holes
Kp values
Solar flares
Radiation storms
Solar wind (Speed, Density), Interplanetary Magnetic Field (IMF) (Bt, Bz)
X4.5 solar flare with a fast coronal mass ejection
Sunspot region 3825 which is close to the east limb and slowly rotating into an earth-facing position has produced a long-duration X4.5 class solar flare (R3-strong) today that peaked at 15:29 UTC. This is the fifth largest solar flare of the current Solar Cycle.
Latest news
Tuesday, 15 April 2025
CME arrival, G3 storm watch
Friday, 28 March 2025
X1.1 solar flare
Monday, 24 March 2025
Coronal hole faces Earth
Latest forum messages
AR 14079 83Incoming & Unnumbered Active Regions 1851Unspecified geomagnetic activity 2384Short PBS episode on Aurora sounds 6Power transmission for all of us. And why I believe we are better prepared than ever for major solar events 33
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Space weather facts
| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/04/30 | M2.03 |
| Last geomagnetic storm | 2025/05/02 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2025 | 140.6 +6.4 |
| May 2025 | 48.5 -92.1 |
| Last 30 days | 116.9 -13.6 |