Image Source: http://www.nasa.gov/images/content/5571 ... g_full.jpg
The Sun unleashed an M-2 (medium-sized) solar flare, an S1-class (minor) radiation storm and a spectacular coronal mass ejection (CME) on June 7, 2011 from sunspot complex 1226-1227. The large cloud of particles mushroomed up and fell back down looking as if it covered an area of almost half the solar surface.
Source: http://www.nasa.gov/mission_pages/sunea ... blast.html
Source: http://articles.latimes.com/2011/feb/17 ... e-20110218Highest such solar activity is expected in 2013