Viewing archive of Tuesday, 21 September 1999

Sunspot numberNew regionsBackground fluxMaximum fluxC
82 40B5.7C9.514

Solar flares

RegionStartMaximumEnd
8699C5.2 03:0003:3203:41
8706C9.4 03:4203:5204:16
8704C2.7 07:1507:2007:24
-C6.4 09:3910:4711:20

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Last M-flare:2017/10/20M1.0
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Number of spotless days in 2019:242
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