ionosphere: Meaning and Definition of

i•on•o•sphere

Pronunciation: (ī-on'u-sfēr"), [key]
— n.
  1. the region of the earth's atmosphere between the stratosphere and the exosphere, consisting of several ionized layers and extending from about 50 to 250 mi. (80 to 400 km) above the surface of the earth.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
ionosonde ion propulsion
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