Comment Section

Definite shock, rotation in mangetic field and weak signatures in velocity, density and temperature indicate there is may be a weak flux rope behind the shock. There are a number of eruptions between the 20-22, but none are full Halo CMEs. The most patial Halo is on the 20th. It is also possible that this event is a combination of multiple eruptions. (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.