Sunspot region AR8415
| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 1998/12/18 | 5 | 10 | BXO | N19E72 | |
| 1998/12/19 | 11 | 190 | EAI | N19E61 | |
| 1998/12/20 | 18 | 270 | EAI | N20E49 | |
| 1998/12/21 | 16 | 170 | EAI | N20E36 | |
| 1998/12/22 | 17 | 130 | EAO | N20E23 | |
| 1998/12/23 | 16 | 70 | CAO | N20E11 | |
| 1998/12/24 | 11 | 40 | CRO | N22W02 | |
| 1998/12/25 | 5 | 10 | BXO | N23W12 | |
| 1998/12/27 | 1 | 0 | AXX | N20W40 | |
| 1998/12/28 | 1 | 0 | AXX | N16W49 |
| B | C | M | X |
|---|---|---|---|
| 1 | 12 | 2 | 1 |
The top 10 solar flares from sunspot region 8415
| Start | Maximum | End | ||||
|---|---|---|---|---|---|---|
| 1 | X1.15 | 1998/12/18 | 17:13 | 17:22 | 17:27 | |
| 2 | M2.63 | 1998/12/20 | 08:49 | 09:00 | 09:03 | |
| 3 | M1.19 | 1998/12/17 | 22:58 | 23:06 | 23:10 | |
| 4 | C7.97 | 1998/12/19 | 23:11 | 23:24 | 23:29 | |
| 5 | C6.39 | 1998/12/19 | 14:26 | 14:36 | 14:41 | |
| 6 | C5 | 1998/12/20 | 05:07 | 05:14 | 05:21 | |
| 7 | C4.97 | 1998/12/18 | 07:42 | 07:50 | 07:58 | |
| 8 | C4.94 | 1998/12/18 | 05:14 | 05:27 | 05:30 | |
| 9 | C4.57 | 1998/12/18 | 03:02 | 03:07 | 03:11 | |
| 10 | C3.6 | 1998/12/18 | 03:43 | 03:48 | 03:51 |
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| Last X-flare | 2026/04/24 | X2.5 |
| Last M-flare | 2026/04/28 | M1.11 |
| Last geomagnetic storm | 2026/04/20 | Kp5 (G1) |
| Spotless days | |
|---|---|
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| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
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| Last 30 days | 90.5 -3.1 |
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