| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 2017/09/26 | 2 | 260 | HKX | N11E76 | |
| 2017/09/27 | 2 | 160 | DAO | N12E60 | |
| 2017/09/28 | 2 | 270 | HKX | N13E46 | |
| 2017/09/29 | 2 | 280 | HKX | N14E26 | |
| 2017/09/30 | 2 | 270 | HKX | N14E21 | |
| 2017/10/01 | 2 | 270 | HKX | N13E08 | |
| 2017/10/02 | 2 | 270 | HKX | N13W05 | |
| 2017/10/03 | 4 | 290 | HKX | N13W19 | |
| 2017/10/04 | 4 | 330 | CKO | N13W32 | |
| 2017/10/05 | 6 | 300 | CKO | N13W45 | |
| 2017/10/06 | 5 | 280 | CKO | N13W58 | |
| 2017/10/07 | 1 | 270 | HKX | N13W71 | |
| 2017/10/08 | 1 | 220 | HAX | N13W84 |
| B | C |
|---|---|
| 21 | 4 |
| Start | Maximum | End | ||||
|---|---|---|---|---|---|---|
| 1 | C2.65 | 2017/09/26 | 02:29 | 02:34 | 02:38 | |
| 2 | C2.49 | 2017/09/27 | 00:50 | 01:01 | 01:07 | |
| 3 | C1.54 | 2017/10/05 | 13:26 | 13:41 | 13:49 | |
| 4 | C1.39 | 2017/10/06 | 16:31 | 16:34 | 16:36 | |
| 5 | B7.58 | 2017/10/05 | 23:19 | 23:27 | 23:33 | |
| 6 | B6.75 | 2017/10/08 | 06:42 | 06:47 | 06:50 | |
| 7 | B6.24 | 2017/10/07 | 23:26 | 00:28 | 01:12 | |
| 8 | B5.01 | 2017/10/05 | 19:51 | 20:02 | 20:10 | |
| 9 | B3.9 | 2017/09/26 | 13:41 | 13:45 | 13:49 | |
| 10 | B3.88 | 2017/10/06 | 19:37 | 19:40 | 19:42 |
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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 | 135.1 +43.3 |
| Last 30 days | 107.1 +10.8 |