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This movie combines Hinode XRT with Hinode SOT Ca II H-line data to demonstrate how a coronal cavity gets a chewy nougat. A chewy nougat is solar slang for hot X-ray emission in the center of a coronal cavity, usually sitting just above a cool prominence. So why does a cool solar prominence have such a hot head?
In this case, hot X-ray plasma slams into the prominence, causing cool prominence material to flow along an arc. Eventually, hot X-ray emission develops near the prominence tip.
Learn more about coronal cavities in this article published in Frontiers in Astronomy and Space Sciences in the coronal
magnetometry research topic.