| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 2017/05/22 | 3 | 40 | DAO | N14E26 | |
| 2017/05/23 | 2 | 20 | CRO | N14E11 | |
| 2017/05/24 | 2 | 20 | HRX | N13W06 | |
| 2017/05/25 | 5 | 30 | CRO | N12W18 | |
| 2017/05/26 | 9 | 80 | DSI | N13W32 | |
| 2017/05/27 | 12 | 170 | DAI | N14W45 | |
| 2017/05/28 | 11 | 180 | DAI | N13W57 | |
| 2017/05/29 | 10 | 220 | DAO | N13W70 | |
| 2017/05/30 | 6 | 180 | DSO | N13W86 | |
| 2017/05/31 | 6 | 180 | DSO | N13W0* |
| B | C |
|---|---|
| 15 | 4 |
| Start | Maximum | End | ||||
|---|---|---|---|---|---|---|
| 1 | C4.8 | 2017/05/28 | 19:22 | 19:28 | 19:37 | |
| 2 | C1.5 | 2017/05/28 | 23:05 | 23:13 | 23:26 | |
| 3 | C1.29 | 2017/05/27 | 17:47 | 18:30 | 19:04 | |
| 4 | C1.1 | 2017/05/28 | 10:46 | 10:51 | 10:54 | |
| 5 | B9.99 | 2017/05/27 | 22:08 | 22:11 | 22:14 | |
| 6 | B9.48 | 2017/05/30 | 19:44 | 19:47 | 19:51 | |
| 7 | B9.37 | 2017/05/29 | 14:40 | 14:48 | 14:57 | |
| 8 | B9.29 | 2017/05/28 | 06:34 | 06:39 | 06:51 | |
| 9 | B9.01 | 2017/05/28 | 11:39 | 11:47 | 11:54 | |
| 10 | B5.85 | 2017/05/30 | 18:39 | 18:44 | 18:47 |
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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 |