Sunspot region AR8464
| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 1999/02/13 | 1 | 70 | EAO | N19E64 | |
| 1999/02/14 | 4 | 160 | ESO | N21E55 | |
| 1999/02/15 | 7 | 90 | CSO | N20E42 | |
| 1999/02/16 | 6 | 90 | CSO | N20E28 | |
| 1999/02/17 | 7 | 80 | CSO | N19E15 | |
| 1999/02/18 | 7 | 70 | DSO | N20E02 | |
| 1999/02/19 | 10 | 70 | CSO | N18W11 | |
| 1999/02/20 | 6 | 50 | CSO | N18W26 | |
| 1999/02/21 | 3 | 30 | CSO | N18W40 | |
| 1999/02/22 | 3 | 20 | CSO | N18W53 | |
| 1999/02/23 | 1 | 0 | AXX | N18W65 |
| C | M |
|---|---|
| 3 | 1 |
The top 4 solar flares from sunspot region 8464
| Start | Maximum | End | ||||
|---|---|---|---|---|---|---|
| 1 | M1.35 | 1999/02/16 | 23:56 | 00:03 | 00:07 | |
| 2 | C3.44 | 1999/02/15 | 18:31 | 18:37 | 18:40 | |
| 3 | C1.53 | 1999/02/19 | 07:28 | 07:33 | 07:36 | |
| 4 | C1.12 | 1999/02/18 | 23:53 | 00:05 | 00:07 |
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| Last X-flare | 2026/03/30 | X1.5 |
| Last M-flare | 2026/04/09 | M1.0 |
| Last geomagnetic storm | 2026/04/03 | Kp7- (G3) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (3%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2026 | 85.9 +7.7 |
| April 2026 | 101.7 +15.8 |
| Last 30 days | 97.5 +41.1 |
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