Sunspot region AR10728
| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 2005/01/26 | 1 | 50 | HSX | S14E66 | |
| 2005/01/27 | 2 | 10 | BXO | S14E53 | |
| 2005/01/28 | 2 | 10 | BXO | S14E36 | |
| 2005/01/29 | 1 | 10 | AXX | S14E24 | |
| 2005/01/31 | 2 | 10 | HSX | S13E01 | |
| 2005/02/01 | 1 | 0 | AXX | S11W12 |
Latest news
Sunday, 1 February 2026
Complex sunspot region 4366
Monday, 19 January 2026
CME impact! S4 solar radiation storm
Sunday, 18 January 2026
X1.9 solar flare with earth-directed CME
Latest forum messages
Feb 8-9 CMEs 9AR4366 974AR 4371 19AR 4373 3Do the high-resolution sunspot counts point to more complex sunspots? 50
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Space weather facts
| Last X-flare | 2026/02/04 | X4.3 |
| Last M-flare | 2026/02/05 | M1.1 |
| Last geomagnetic storm | 2026/02/05 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| January 2026 | 112.6 -11.4 |
| February 2026 | 139.3 +26.7 |
| Last 30 days | 125.9 +20.7 |