Comment Section

Very strong compressed magnetic field in the sheath region, in the possible cloud (the region with lower density and lower temperature) the magnetic field is pretty week. Given the high velocities before and after the low density region, there may be some CIR involvement. I think there is a CME involved here, but not a particularly strong flux rope. (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.