21st Feb Another large sunspot

[John W (John Wilkinson)]

21st Feb. Only two groups of sunspots visible today after a quiet period but one of them is large - I measured it at 125,700 km across. This single exposure image was taken with a Canon 550d camera attached to a 81 mm WO refractor with Herschel wedge at 540 nm wavelength.
Thanks for viewing.


Update: There was a X1.9 flare from AR3590 on 21st Feb at 23.52 hrs UTC. It lasted 7 min.

[Tinderboxsky (Steve)]

Nice, clear image, John. Thanks for posting.

[EpickCrom (Joe)]

That's a whopper of a sunspot! Thanks for posting John.

[Saturnine (Jeff)]

Fine image as per usual JW, it is a big AR, did a visual of it yesterday and just read that it has released an X1 ! flare, so will be worth watching over the next week or so as it traverses the disc .