Sunspot region AR12866
| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 2021/09/04 | 2 | 40 | BXO | S18E63 | |
| 2021/09/05 | 8 | 80 | DAI | S18E50 | |
| 2021/09/06 | 15 | 220 | DAI | S17E35 | |
| 2021/09/07 | 23 | 430 | DKC | S17E21 | |
| 2021/09/08 | 15 | 500 | DKC | S18E07 | |
| 2021/09/09 | 29 | 500 | DKC | S18W06 | |
| 2021/09/10 | 17 | 460 | DKC | S18W18 | |
| 2021/09/11 | 17 | 400 | DKC | S18W32 | |
| 2021/09/12 | 10 | 180 | DAI | S19W43 | |
| 2021/09/13 | 7 | 100 | DAO | S19W60 | |
| 2021/09/14 | 3 | 60 | HSX | S18W71 | |
| 2021/09/15 | 1 | 30 | HSX | S18W85 |
2021/09/04
2021/09/05
2021/09/06
2021/09/07
2021/09/08
2021/09/09
2021/09/10
2021/09/11
2021/09/12
2021/09/13
2021/09/14
2021/09/15
|
2021/09/04
2021/09/05
2021/09/06
2021/09/07
2021/09/08
2021/09/09
2021/09/10
2021/09/11
2021/09/12
2021/09/13
2021/09/14
2021/09/15
|
| B | C |
|---|---|
| 20 | 4 |
The top 10 solar flares from sunspot region 12866
| Start | Maximum | End | ||||
|---|---|---|---|---|---|---|
| 1 | C8.4 | 2021/09/08 | 17:11 | 17:30 | 17:49 | |
| 2 | C3.5 | 2021/09/09 | 08:09 | 08:31 | 08:43 | |
| 3 | C1.2 | 2021/09/08 | 10:20 | 10:26 | 10:31 | |
| 4 | C1.1 | 2021/09/07 | 09:29 | 09:34 | 09:39 | |
| 5 | B8.2 | 2021/09/09 | 17:10 | 17:16 | 17:20 | |
| 6 | B7.7 | 2021/09/08 | 15:00 | 15:11 | 15:29 | |
| 7 | B7.5 | 2021/09/07 | 01:44 | 01:56 | 02:06 | |
| 8 | B7.2 | 2021/09/09 | 16:58 | 17:08 | 17:10 | |
| 9 | B6.9 | 2021/09/07 | 09:15 | 09:26 | 09:29 | |
| 10 | B5.7 | 2021/09/07 | 03:29 | 03:39 | 03:46 |
Latest news
Tuesday, 17 March 2026
M2.7 solar flare, CME arrival possible
Sunday, 1 February 2026
Complex sunspot region 4366
Monday, 19 January 2026
CME impact! S4 solar radiation storm
Latest forum messages
AR4392 (including CMEs) 112CH 31 HSS 17Growth of Cycle 25 987Incoming & Unnumbered Active Regions 224Current Farside Activity 418
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Space weather facts
| Last X-flare | 2026/02/04 | X4.21 |
| Last M-flare | 2026/03/18 | M2.7 |
| Last geomagnetic storm | 2026/03/14 | Kp6 (G2) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (4%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| February 2026 | 78.2 -34.3 |
| March 2026 | 82.4 +4.2 |
| Last 30 days | 62.7 -52.5 |