Sunspot region 2403 remains active and this morning it produced the strongest solar flare thus far: an impulsive M5.6 (R2-moderate) solar flare that peaked at 07:33 UTC. No radio sweeps were reported from this impulsive solar flare which indicated that a coronal mass ejection from this event would be unlikely. SOHO coronagraph imagery confirms that this solar flare indeed did not launch a coronal mass ejection.
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| Last X-flare | 2025/12/08 | X1.1 |
| Last M-flare | 2025/12/12 | M1.1 |
| Last geomagnetic storm | 2025/12/12 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| November 2025 | 91.8 -22.8 |
| December 2025 | 131.8 +40 |
| Last 30 days | 108.3 +14.5 |