On March 12, 2012 Sunsflare posted a video asking if anyone could identify a circular object seen in SDO coronal images, concerning a black spherical anomoly the size of Jupiter on the south east limb of the sun.

The video was also posted on Facebook with the same question posed.



I answered the question on facebook but here is a more detailed response and discussion of the observation. The object seen is a coronal cavity associated with a filament. There was also an eruption of the filament with a CME. ” – C. Alex Young, Ph.D. Image Credit: NASA SDO