Summer is upon us in the northern hemisphere and that means very little aurora sightings. The fact that we are in a very quiet space weather period doesn't help either of course but after a long and cold winter these warm rays of sunshine are very much welcome. Right? Or are you starting to experience aurora withdrawal symptoms? Either way, something has been drawing our attention today and that is the Sun's X-ray output as measured by GOES-15. Indeed: we are talking about solar flares.
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| Last X-flare | 2025/12/01 | X1.9 |
| Last M-flare | 2025/12/06 | M8.1 |
| Last geomagnetic storm | 2025/12/04 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| November 2025 | 91.8 -22.8 |
| December 2025 | 167.7 +75.9 |
| Last 30 days | 107.1 +13.7 |