A large southern extension of the northern hemisphere polar coronal hole is facing Earth today.
A huge surprise last evening as solar activity unexpectedly reached moderate level thanks to an M1.11 (R1-minor) solar flare that took place behind the east limb. The solar flare peaked at 23:28 UTC on 20 October 2017.
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|Last geomagnetic storm||2020/04/20||Kp5 (G1)|
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