Comment Section

I believe this is a complex event, caused by a merger between a partial halo CME on October 21 and the shock wave of a CME at the North Eastern Limb on the 22nd. I believe the halo CME was propagating towards the Earth, then the shock wave caught the CME front and accelerated it faster.(Hess)
Two full halo CMEs are involved in this event

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.

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The GOES X-ray Flux of the flare associated with the event. The vertical line approximately denotes the flare peak time.