shrinking

Except AR4425, which shows a 2 Earths wide dark core, all current sunspots are decaying into small fragments. AR4420 is about to rotate over the western limb but still maintains a delta magnetic component capable of sending surprises. Kp auroral index and solar winf speed went up the last day due to a big coronal hole in the northern hemisphere.

Newt 4.5" + solar film, 1/640s ISO100

crop, b/c