STEREO B image, linked from SpaceWeather.com
Yesterday, this region produced a Coronal Mass Ejection (CME), a violent release of mass, radiation, and magnetic field into the solar system. While this particular CME had no chance of hitting the Earth, these are the kind of events that damage satellites, over load electrical grids, put our astronauts in danger and produce the beautiful aurora. The sun is, apparently, slowly waking from its long cycle minimum.
A movie of the CME event can be found here.
Be sure to check out the latest images from the STEREO Mission!