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:
1970–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To coronal hole
Explore Dictionary.com
Previous Definition: coronal
Next Definition: coronal mass ejection
Words Near: coronal hole
More from Thesaurus.com
Synonyms and Antonyms for coronal hole
More from Reference.com
Search for articles containing coronal hole
More from Dictionary.com Translator
Dictionary.com Word FAQs

Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.

Example sentences
The storms were due to the onset of a coronal hole high-speed solar wind stream.
Images for coronal hole
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature