Extremely complex and exciting groups on Sun today
Well, Sting (from The Police) may have sung "There's a little black spot on the Sun today", but that was far from the truth today. Several large groups (AR 1861, 1864, 1865) have rotated into view and, one of them, AR1865, according to spaceweather.com, "harbors energy for X-class flares." I mentioned this group to a colleague recently, when AR1865 was still on the limb. I'lll be watching these groups closely, weather permitting, of course. Observed from Woburn Hilton parking lot during a coffee break at the AAVSO Fall Meeting. 1654UT.