I think I can make out enough of a spread of the Ejecta for this to be a Type III Halo Event in this MPeg [link to stereo.gsfc.nasa.gov] Covers more than 180 Degrees,even appears to be some(though very faint)headed Northerly,though that could simply be from other Streamers.

The DiffMPeg [link to stereo.gsfc.nasa.gov] .