Polar Crown Prominences
Studying polar crown prominences could be a key to forecasting space weather. The central sheets form between regions of opposite-polarity magnetic field. That's significant because opposite magnetic fields bumping together tend to explode—a process physicists call "reconnection." Polar crown prominences are thus poised to erupt and often do, forming the cores of billion-ton coronal mass ejections credit: NASARelated Videos
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