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ionosphere
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ionosphere
The Oxford Pocket Dictionary of Current English
i·on·o·sphere
/ īˈänəˌsfi(ə)r/
•
n.
the layer of the earth's atmosphere that contains a high concentration of ions and free electrons and is able to reflect radio waves. It lies above the mesosphere and extends from about 50 to 600 miles (80 to 1,000 km) above the earth's surface.
∎
a similar region above the surface of another planet.
DERIVATIVES:
i·on·o·spher·ic
/ īˌänəˈsfi(ə)rik; -ˈsfer-/ adj.
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© The Oxford Pocket Dictionary of Current English 2008, originally published by Oxford University Press 2008.
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