Comment Section

Sheath signatures are weak, so this probably is not a shock. A slower event, the magnetic field still manages to reach 21.5 nT and looks like it expands gradually over longer time. Also signs of rotation in the magnetic field (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.