Ok the GONG data is dated 03-11-12 and the HMI data is dated 03-09-12 with the circled Trianglular shape. It is on the far side of the Sun and seemed to be missing from the GONG data which is maybe why it is circled.



Now the really strange thing is the dark Trianglular(ish) shadow shape showing up in all of the AIA images that sort of mirrors the HMI data that is on the farside of the sun (the side we cannot currently see).



But that could just be pareidolia, I have to admit I have never seen such a strange large shadow (no activity) like before though, and I check out SOHO daily...