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Sunspot region AR8517

Number of
sunspots		 Size Class Magn. Class Spot Location
1999/04/17 4 20 BXO N20W21
1999/04/18 3 30 CSO N22W36
1999/04/19 6 30 CRO N22W51
1999/04/20 5 70 DSO N22W63
1999/04/21 3 100 DSO N22W77
1999/04/22 1 40 HSX N24W88
BC
31

The top 4 solar flares from sunspot region 8517

Start Maximum End
1C1.11999/04/1821:1221:1921:23
2B8.361999/04/2100:1900:2200:27
3B6.761999/04/2116:4616:5016:52
4B5.231999/04/2106:0206:0506:07
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Last X-flare2026/03/30X1.5
Last M-flare2026/04/09M1.0
Last geomagnetic storm2026/04/03Kp7- (G3)
Spotless days
Last 365 days3 days
20263 days (3%)
Last spotless day2026/02/24
Monthly mean Sunspot Number
March 202685.9 +7.7
April 2026118.8 +32.8
Last 30 days102.1 +47

This day in history*

Solar flares
12001X1.14
22000M4.54
32003M3.68
42002M3.12
52002M1.68
DstG
11984-100G3
21971-97G2
32006-82G2
41959-73G2
51995-68G1
*since 1994

Aurora on this day in history

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