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Old sunspot region 3664 returns with an M9.3 solar flare!

Old sunspot region 3664 and more recently 3697 is back for a third visit of the earth-facing solar disk. The region received sunspot number 3723 and immediately announced its return with an impulsive and non-eruptive M9.3 (R2-moderate) solar flare that peaked at 13:01 UTC. It has decayed heavily as expected of course but there still seems to be some gas in the tank for major eruptions! Exciting!

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Sunday, 1 February 2026

Complex sunspot region 4366

Monday, 19 January 2026

CME impact! S4 solar radiation storm

Sunday, 18 January 2026

X1.9 solar flare with earth-directed CME

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Do the high-resolution sunspot counts point to more complex sunspots? 57 Current Farside Activity 371 Incoming & Unnumbered Active Regions 154 Feb 8-9 CMEs 21 AR4366 999

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