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STEREO Observing AR903 - Dec. 4, 2006
A close up of loops in a magnetic active region. These loops, observed by STEREO's SECCHI/EUVI telescope, are at a million degrees K. This powerful active region, AR903, observed here on Dec. 4, 2006, produced a series of intense flares, particle storms, and coronal mass ejections over the next few days.
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