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Sunspot region AR8639

Number of
sunspots		 Size Class Magn. Class Spot Location
1999/07/20 5 10 BXO N38W14
1999/07/21 5 20 BXO N39W26
1999/07/22 11 50 DSO N38W37
1999/07/23 12 400 DAI N38W50
1999/07/24 13 390 DKO N38W62
1999/07/25 14 290 DAO N38W74
1999/07/26 8 230 DAO N38W87
CM
12

The top 3 solar flares from sunspot region 8639

Start Maximum End
1M3.441999/07/2513:0813:3814:17
2M1.11999/07/2420:4020:4820:59
3C3.691999/07/2202:3202:3902:46
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AR4420 217AR4425 62SWPC Display bug or other issues 33CMEs from AR4420 (April 23th - 24th) 55Incoming & Unnumbered Active Regions 294
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Last X-flare2026/04/24X2.5
Last M-flare2026/04/28M1.1
Last geomagnetic storm2026/04/20Kp5 (G1)
Spotless days
Last 365 days3 days
20263 days (3%)
Last spotless day2026/02/24
Monthly mean Sunspot Number
March 202685.9 +7.7
April 202690.3 +4.4
Last 30 days91.7 +3.3

This day in history*

Solar flares
12022X1.1
22024M9.53
32022M4.8
42022M2.6
52023M2.4
DstG
11960-325G5
21990-84G2
31991-74G1
42003-67G2
52014-67
*since 1994

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