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Halloween's Erupting Prominence
A solar prominence that had been hovering above the Sun's surface became unstable and erupted, sending a relatively small cloud of particles headed towards Earth (Oct. 31, 2011). Prominences are elongated clouds of somewhat cooler gases, which are tethered to the Sun by magnetic forces. They can last from days to months, but often they break apart in eruptions. This image and video were taken in extreme ultraviolet light by NASA's STEREO Behind spacecraft. The video clip covers about 12 hours of activity.
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