Comment Section

Very Powerful, fast CME eruption from NW section of the disk around 04:00 on the 23rd, that sent a shock and probably a flank of CME to the Earth. Strong M Class flare from AR 11402, but there were a number of active regions nearby that could have played a role in the eruption. (Hess)

Image Data

A combination of SWEPAM and MAG data from the ACE Satellite:

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The blue lines are an approximation of the CME cloud and the red line denotes the shock.