Comment Section

Source region is probably a gradual faint halo CME as seen in LASCO C2; from CDAW, 2008/12/12 08:54 UT, PA 297, AW 184, Vel 203 km/s
STEREO COR2 A and B clearly shows an Earth-directed CME
Surface source region is a quiet Sun filament eruption; The Sun is in deep minimum, and there is no single active region on the front disk.

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.