| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 1999/12/17 | 12 | 40 | CRO | S14E24 | |
| 1999/12/18 | 12 | 70 | DAO | S13E10 | |
| 1999/12/19 | 19 | 100 | DAO | S13W02 | |
| 1999/12/20 | 13 | 70 | DAO | S13W16 | |
| 1999/12/21 | 8 | 30 | DSO | S13W31 | |
| 1999/12/22 | 7 | 20 | BXO | S13W43 | |
| 1999/12/23 | 6 | 50 | DAO | S14W57 | |
| 1999/12/24 | 4 | 30 | DSO | S14W69 | |
| 1999/12/25 | 3 | 0 | BXO | S13W80 |
| C |
|---|
| 5 |
| Start | Maximum | End | ||||
|---|---|---|---|---|---|---|
| 1 | C6.26 | 1999/12/22 | 00:01 | 00:10 | 00:17 | |
| 2 | C4.91 | 1999/12/21 | 23:30 | 23:38 | 23:46 | |
| 3 | C4.47 | 1999/12/22 | 13:44 | 13:54 | 14:02 | |
| 4 | C2.37 | 1999/12/17 | 17:39 | 17:50 | 18:37 | |
| 5 | C2.29 | 1999/12/23 | 17:24 | 17:29 | 17:33 |
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| 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 | |
|---|---|
| December 2025 | 124 +32.2 |
| February 2026 | 141.3 +17.3 |
| Last 30 days | 123.9 +16.5 |