Comment Section

Tracing the density enhancement visible on the 16th in HI2 backwards, there isn't really a corresponding Halo CME I can see in LASCO. I think what hit the Earth was the flank of an Eastward directed eruption late on the 14th. (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.