Sunspot region AR8737
| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 1999/10/20 | 8 | 50 | CAO | S15E14 | |
| 1999/10/21 | 17 | 70 | DAO | S16E01 | |
| 1999/10/22 | 28 | 170 | EAI | S15W12 | |
| 1999/10/23 | 22 | 310 | EAI | S15W26 | |
| 1999/10/24 | 17 | 270 | EKO | S14W40 | |
| 1999/10/25 | 13 | 330 | EKO | S13W54 | |
| 1999/10/26 | 5 | 370 | EAO | S13W67 | |
| 1999/10/27 | 5 | 360 | EAO | S15W78 | |
| 1999/10/28 | 1 | 140 | HSX | S13W89 |
| C | M |
|---|---|
| 4 | 1 |
The top 5 solar flares from sunspot region 8737
| Start | Maximum | End | ||||
|---|---|---|---|---|---|---|
| 1 | M2.59 | 1999/10/27 | 13:24 | 13:37 | 14:01 | |
| 2 | C6.89 | 1999/10/25 | 19:28 | 19:48 | 20:01 | |
| 3 | C4.43 | 1999/10/26 | 12:56 | 13:00 | 13:03 | |
| 4 | C2.84 | 1999/10/21 | 06:20 | 06:25 | 06:30 | |
| 5 | C1.59 | 1999/10/19 | 17:07 | 17:16 | 17:21 |
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Space weather facts
| Last X-flare | 2026/03/30 | X1.4 |
| Last M-flare | 2026/03/28 | M1.3 |
| Last geomagnetic storm | 2026/03/25 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (3%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| February 2026 | 78.2 -34.3 |
| March 2026 | 86.6 +8.4 |
| Last 30 days | 86.6 +11.2 |
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