Comment Section

A slow CME swept up by a CIR (J. Zhang)
Not sure about the source CME (1) 04/19 15 UT CME, or (2) 04/18 03 UT CME (also other halo CMEs on 04/18); need further work on this.
- It is always a problem of identification when a slow ICME occurs.

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.