Usually means: Region where solar magnetic field opens.
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We found 9 dictionaries that define the word coronal hole:

General (4 matching dictionaries)
  1. coronal hole: Wiktionary
  2. coronal hole: Infoplease Dictionary
  3. coronal hole: Dictionary.com
  4. Coronal hole: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. coronal hole: Encyclopedia

Science (2 matching dictionaries)
  1. From Stargazers to Starships Glossary (No longer online)
  2. Coronal Hole: Extragalactic Astronomy

Tech (2 matching dictionaries)
  1. National Weather Service Glossary (No longer online)
  2. SOLAR-TERRESTRIAL TERMS (No longer online)

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Definitions from Wiktionary (coronal hole)

▸ noun:  (astrophysics) A region in the corona of a star where magnetic field lines extend out into space, allowing solar wind to escape.

Similar:
corona, solar corona, helmet streamer, ringhole, footpoint, geocorona, pseudostreamer, fallstreak hole, astrosphere, keyhole, more...

Opposite:
solar flare, sunspot, solar activity, solar storm

▸ Words similar to coronal hole

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Similar:
corona, solar corona, helmet streamer, ringhole, footpoint, geocorona, pseudostreamer, fallstreak hole, astrosphere, keyhole, more...

Opposite:
solar flare, sunspot, solar activity, solar storm



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