coronal hole

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noun Astronomy.

a part of the solar corona that appears dark on optical and x-ray images and is characterized by low temperature and low density.

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Origin of coronal hole

First recorded in 1970–75

Words nearby coronal hole

corona discharge, Coronado, Coronado, Francisco, coronagraph, coronal, coronal hole, coronal mass ejection, coronal suture, corona radiata, coronary, coronary arteries