reply to post by Chadwickus
Are you sure that's visible light?

So two filaments are making a very rough ring shape, I don't see the big deal.
Originally posted by Chadwickus
reply to post by nobody you know
As the article at Spaceweather says, the lower part is a filament connected to sunspot 1112.
The top part is a coronal hole I think.
Solar wind from that is on it's way to earth and will arrive on the 19th - 20th.

There isn't really any "ring" developing. There are two (at least) quite separate filaments which can be seen more clearly in the 193nm image