Valentine Flare and CME

The STEREO Ahead spacecraft kept a close eye on two active regions on Feb. 12, 2010. The one on the left popped off a small flare. The still shows the bright flash of the flare in UV light at 195 Angstroms. The active region near the center shows a lot of magnetic struggles within it, and it bursts out a small coronal mass ejection (CME) after the arch of particles is seen rising up. Flares are intense explosions on the Sun that blast out radiation into space. CMEs are larger and longer lasting solar storms that carry a larger cloud of particles and magnetic field into space. Both can create what we call Òspace weatherÓ effects such as power disruptions, satellite problems, and aurora if aimed at Earth.

• ST_Feb_ARs_4.mov   
• ST_Feb_ARs_best.mov   
• ST_Feb_ARs.mpg   
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