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, though, at least in the COR2 FOV it doesn't seem fast enough. (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.