Sunspot region AR8537
| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 1999/05/08 | 9 | 40 | CSO | N19W60 | |
| 1999/05/09 | 7 | 230 | EAO | N19W73 | |
| 1999/05/10 | 4 | 170 | DAO | N20W88 |
| C | X |
|---|---|
| 5 | 1 |
The top 6 solar flares from sunspot region 8537
| Start | Maximum | End | ||||
|---|---|---|---|---|---|---|
| 1 | X1.1 | 1999/05/09 | 17:53 | 18:07 | 18:15 | |
| 2 | C7.31 | 1999/05/09 | 16:06 | 16:12 | 16:19 | |
| 3 | C6.61 | 1999/05/08 | 01:55 | 02:03 | 02:11 | |
| 4 | C5.36 | 1999/05/08 | 05:05 | 05:15 | 05:18 | |
| 5 | C4.8 | 1999/05/08 | 01:00 | 01:12 | 01:23 | |
| 6 | C3.1 | 1999/05/08 | 19:45 | 19:48 | 19:51 |
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| Last X-flare | 2026/03/30 | X1.5 |
| 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 |
| April 2026 | 130 +51.8 |
| Last 30 days | 91.6 +20.3 |
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