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plasmasphere

[plaz-muh-sfeer] /ˈplæz məˌsfɪər/
noun, Astronomy
1.
a region of cool plasma surrounding the earth, extending 8000–25,000 miles (13,000–40,000 km) into space, and bounded by the plasmapause.
Origin
1965-1970
1965-70; plasma + -sphere
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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