IONOSPHERE

ionosphere

(noun) the outer region of the Earth’s atmosphere; contains a high concentration of free electrons

Source: WordNet® 3.1

Etymology

Noun

ionosphere (plural ionospheres)

The part of the Earth's atmosphere beginning at an altitude of about 50 kilometers (31 miles) and extending outward 500 kilometers (310 miles) or more.

The similar region of the atmosphere of another planet.

Source: Wiktionary

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