‘Crackling Sunspot’, July 30-31, 2012.
”Newly-numberd sunspot AR1538 is small but active. In an 18-hour period on July 30-31, it popped off more than 15 minor flares. Watch the sunspot crackle in this movie from NASA’s Solar Dynamics Observatory.”
(Source: spaceweather.com, via understandingtheuniverse)
