Sunspot region AR12420
| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 2015/09/21 | 12 | 270 | EKC | N09E71 | |
| 2015/09/22 | 16 | 290 | EKC | N10E64 | |
| 2015/09/23 | 13 | 280 | EKC | N10E50 | |
| 2015/09/24 | 13 | 280 | EKC | N10E50 | |
| 2015/09/25 | 19 | 200 | EAI | N09E22 | |
| 2015/09/26 | 17 | 150 | FAI | N10E09 | |
| 2015/09/27 | 15 | 140 | FAI | N10W04 | |
| 2015/09/28 | 11 | 110 | FAI | N11W17 | |
| 2015/09/29 | 9 | 100 | ESO | N11W31 | |
| 2015/09/30 | 12 | 50 | CSO | N11W44 | |
| 2015/10/01 | 2 | 40 | CSO | N12W57 | |
| 2015/10/02 | 3 | 20 | CRO | N10W70 | |
| 2015/10/03 | 3 | 10 | BXO | N11W84 | |
| 2015/10/04 | 1 | 30 | HAX | N14W91 | |
| 2015/10/05 | 1 | 30 | HAX | N14W0* |
2015/09/21
2015/09/22
2015/09/23
2015/09/24
2015/09/25
2015/09/26
2015/09/27
2015/09/28
2015/09/29
2015/09/30
2015/10/01
2015/10/02
2015/10/03
2015/10/04
|
2015/09/21
2015/09/22
2015/09/23
2015/09/24
2015/09/25
2015/09/26
2015/09/27
2015/09/28
2015/09/29
2015/09/30
2015/10/01
2015/10/02
2015/10/03
2015/10/04
|
| B | C | M |
|---|---|---|
| 4 | 6 | 2 |
The top 10 solar flares from sunspot region 12420
| Start | Maximum | End | ||||
|---|---|---|---|---|---|---|
| 1 | M2.2 | 2015/09/20 | 04:55 | 05:03 | 05:17 | |
| 2 | M1.27 | 2015/09/21 | 05:11 | 05:18 | 05:22 | |
| 3 | C6.07 | 2015/09/21 | 01:57 | 02:04 | 02:08 | |
| 4 | C4.02 | 2015/09/21 | 00:10 | 00:21 | 00:29 | |
| 5 | C3.97 | 2015/10/03 | 18:04 | 18:09 | 18:15 | |
| 6 | C2.11 | 2015/09/21 | 03:54 | 04:00 | 04:05 | |
| 7 | C1.57 | 2015/10/03 | 16:23 | 16:44 | 16:52 | |
| 8 | C1.27 | 2015/09/20 | 13:49 | 13:54 | 13:58 | |
| 9 | B8.62 | 2015/09/21 | 03:29 | 03:33 | 03:37 | |
| 10 | B7.02 | 2015/09/21 | 18:52 | 18:53 | 18:54 |
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Space weather facts
| Last X-flare | 2025/06/19 | X1.9 |
| Last M-flare | 2025/10/03 | M1.2 |
| Last geomagnetic storm | 2025/10/03 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| September 2025 | 129.8 -3.7 |
| October 2025 | 140.1 +10.3 |
| Last 30 days | 131.3 -1.2 |