| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 1999/09/11 | 1 | 20 | HSX | N19E73 | |
| 1999/09/12 | 1 | 40 | HSX | N20E60 | |
| 1999/09/13 | 1 | 30 | HSX | N20E48 | |
| 1999/09/14 | 5 | 40 | CSO | N21E34 | |
| 1999/09/15 | 2 | 30 | CSO | N21E21 | |
| 1999/09/16 | 3 | 40 | CSO | N22E08 | |
| 1999/09/17 | 3 | 30 | CSO | N21W04 | |
| 1999/09/18 | 1 | 20 | HSX | N21W16 | |
| 1999/09/19 | 2 | 20 | CSO | N21W31 | |
| 1999/09/20 | 1 | 10 | HSX | N21W42 | |
| 1999/09/21 | 1 | 10 | AXX | N21W56 | |
| 1999/09/22 | 1 | 0 | AXX | N22W70 |
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| Last X-flare | 2026/02/04 | X4.21 |
| Last M-flare | 2026/03/18 | M2.7 |
| Last geomagnetic storm | 2026/03/22 | Kp7- (G3) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (4%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| February 2026 | 78.2 -34.3 |
| March 2026 | 77 -1.2 |
| Last 30 days | 68.9 -24 |