Solar Flares

http://en.wikipedia.org/wiki/Solar_flare
http://hesperia.gsfc.nasa.gov/sftheory/flare.htm
http://www.space.com/11506-space-weather-sunspots-solar-flares-coronal-mass-ejections.html

Videos
 http://www.cbsnews.com/video/watch/?id=50146797n