April 11, 2022:
The corpse of old sunspot AR2987 exploded today, April 11, 2022, hurling debris directly toward Earth. NASA’s Solar Dynamics Observatory recorded the eruption:
The S-shaped magnetic filament at the base of the explosion is a classic „sigmoid structure.“
Solar magnetic fields often assume this shape just before they explode. One study shows that sigmoid precursors are present in over 50% of CMEs.
Indeed, shortly after the explosion, a full-halo CME emerged from the blast site. Here it is.
The CME is expected to reach Earth on April 14th; a new NOAA model pinpoints its arrival time at 1100 UTC. The impact could spark a G2-class geomagnetic storm.
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via Spaceweather.com
April 12, 2022