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Published on Mar 13, 2012
http://www.thesuntoday.org - On March 12, 2012 Sunsflare posted a video asking if anyone could identify a circular object seen in SDO coronal images. 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.