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coronal hole

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.
Origin of coronal hole
1970-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for coronal hole
  • The storms were due to the onset of a coronal hole high-speed solar wind stream.

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