It is a cosmic particle striking the imaging system, or maybe a ‘light leak’ caused by a hole in the micro meteorite shield that protects the lenses on SDO or... NASA's SDO Satellite captured an extraterrestrial spacecraft?
Link Helioviewer: Original SDO image from 2014-11-19
But wait... this is the second time within three weeks NASA's SDO captured this object. On October 28, the satellite recorded the UFO and again on November 19.
Image left: Same object captured by SDO on October 28.
Coincidence or we may conclude that this object with its specific rectangular structure is an alien craft. See video from October 28