noun Astronomy.

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 of plasmasphere

First recorded in 1965–70; plasma + -sphere Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for plasmasphere

Historical Examples of plasmasphere

  • The plasmasphere of Eisberg differed from that of Earth in two ways.

    Unwise Child

    Gordon Randall Garrett