One of the nice things about Solar observing is that things change, often in a very short time-frame. On Friday morning, I looked at the GONG web-site, and clearly something was going on around sunspot 2628. To quote “SpaceWeather”:
“After weeks of no solar flares, there have been half a dozen in the past 24 hours. The source of the activity is two new sunspots emerging in the sun’s northern hemisphere: AR2527 and AR2528. The magnetic canopy of these sunspots is crackling with C-class solar flares”.
“It is important to note that these are not major flares. The strongest so far has registered C9 on the Richter Scale of Solar Flares. During Solar Maximum, such a puny flare would not be mentioned as busy space weather forecasters tracked explosions 100x more potent. But now, with sunspot counts so low and flares so seldom, a C9 event is noteworthy.
Extreme UV radiation from C-class flares can produce minor waves of ionization in Earth’s upper atmosphere and interfere with the normal propagation of shortwave radio signals–mainly at frequencies 10 MHz and below. Stronger flares could be in the offing as sunspot complex AR2627-2628 continues to grow. Stay tuned for updates.”
I was too late to catch the most of the activity, but I did see changes over a few hours: