Halo CME - July 30, 2007

The COR1 coronagraph instrument on STEREO caught a nice "halo" CME (coronal mass ejection) as it expanded out into space on July 30, 2007. It is named "halo" CME when the leading edge of the particle cloud appears as an expanding arc around the Sun, something we can see, though faintly, in this video. The ejected material is either heading more or less directly towards or away from the viewer. In this case, the event was judged to have occurred on the backside of the Sun as we saw no evidence of an event on the front side. The video clip covers about 8 hours of activity.

• HaloCME20070730.mov - (7.19 mb)   
• HaloCME20070730.mpg - (3.22 mb)   
• Print version. Right click for download.