Sunspot region AR8731
| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 1999/10/12 | 6 | 120 | EAO | N10E62 | |
| 1999/10/13 | 14 | 340 | EKO | N11E51 | |
| 1999/10/14 | 38 | 620 | EKO | N11E37 | |
| 1999/10/15 | 45 | 790 | EKC | N19E24 | |
| 1999/10/16 | 27 | 850 | FKC | N12E10 | |
| 1999/10/17 | 62 | 1000 | FKC | N12W03 | |
| 1999/10/18 | 54 | 1220 | FKC | N13W19 | |
| 1999/10/19 | 35 | 980 | FKC | N19W27 | |
| 1999/10/20 | 63 | 640 | FKC | N13W44 | |
| 1999/10/21 | 45 | 440 | EKI | N14W55 | |
| 1999/10/22 | 28 | 320 | EAI | N12W67 | |
| 1999/10/23 | 12 | 160 | ESI | N12W79 |
| C | M | X |
|---|---|---|
| 9 | 1 | 1 |
The top 10 solar flares from sunspot region 8731
| Start | Maximum | End | ||||
|---|---|---|---|---|---|---|
| 1 | X2.63 | 1999/10/14 | 08:54 | 09:00 | 09:03 | |
| 2 | M1.06 | 1999/10/15 | 00:58 | 01:15 | 01:31 | |
| 3 | C8.21 | 1999/10/14 | 02:28 | 02:38 | 02:50 | |
| 4 | C6.1 | 1999/10/14 | 03:19 | 03:24 | 03:30 | |
| 5 | C5.37 | 1999/10/15 | 12:18 | 12:27 | 12:39 | |
| 6 | C4.36 | 1999/10/15 | 21:32 | 21:38 | 21:41 | |
| 7 | C3.96 | 1999/10/18 | 17:33 | 17:39 | 17:45 | |
| 8 | C3.87 | 1999/10/14 | 22:27 | 22:31 | 22:34 | |
| 9 | C3.66 | 1999/10/15 | 22:26 | 22:31 | 22:35 | |
| 10 | C2.66 | 1999/10/12 | 07:45 | 08:54 | 09:52 |
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| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/04/15 | M1.2 |
| Last geomagnetic storm | 2025/04/16 | Kp8- (G4) |
| Spotless days | |
|---|---|
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| Monthly mean Sunspot Number | |
|---|---|
| March 2025 | 134.2 -20.4 |
| April 2025 | 120.5 -13.7 |
| Last 30 days | 116.6 -25.7 |