SolarWatcher さんが 2011/07/30 にアップロードSTRONG FLARE: AR11261 unleashed a brief but strong M9-class solar flare on July 30th at 0209 UT. Because of its brevity, the eruption probably did not hurl a substantial CME toward Earth, but this is not yet a firm conclusion
Three big sunspot groups are rotating across the Earth-facing side of the sun. One of them, AR1261, is morphing into a circular ring. The magnetic field of this shape-shifting sunspot is crackling with C- and M-class solar flares, including a powerful M9-blast to begin the day on July 30th. NOAA forecasters estimate a 40% chance of more such flares during the next 24 hours.