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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
BC
204

The top 10 solar flares from sunspot region 12866

Start Maximum End
1C8.42021/09/0817:1117:3017:49
2C3.52021/09/0908:0908:3108:43
3C1.22021/09/0810:2010:2610:31
4C1.12021/09/0709:2909:3409:39
5B8.22021/09/0917:1017:1617:20
6B7.72021/09/0815:0015:1115:29
7B7.52021/09/0701:4401:5602:06
8B7.22021/09/0916:5817:0817:10
9B6.92021/09/0709:1509:2609:29
10B5.72021/09/0703:2903:3903:46
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Space weather facts

Last X-flare2026/03/30X1.5
Last M-flare2026/04/03M1.3
Last geomagnetic storm2026/04/02Kp6- (G2)
Spotless days
Last 365 days3 days
20263 days (3%)
Last spotless day2026/02/24
Monthly mean Sunspot Number
March 202685.9 +7.7
April 2026141 +55.1
Last 30 days94.6 +27

This day in history*

Solar flares
12001X1.77
22017M8.35
31999M6.2
42001M3.57
52017M1.81
DstG
11979-168G4
21960-151G3
31992-105G2
42004-104G2
51994-103G3
*since 1994

Aurora on this day in history

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