a belt of ionized hydrogen surrounding the earth at the outer limit of the exosphere.

1955–60; geo- + corona

geocoronal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
geocorona   (jē'ō-kə-rō'nə)  Pronunciation Key 
The halo of far-ultraviolet solar light that reflects off the Earth's exosphere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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