ionosphere

noun ion·o·sphere \ ī-ˈä-nə-ˌsfir \
Updated on: 4 Apr 2018

Definition of ionosphere

: the part of the earth's atmosphere in which ionization of atmospheric gases affects the propagation of radio waves, which extends from about 30 miles (50 kilometers) to the exosphere, and which is contiguous with the upper portion of the mesosphere and the thermosphere; also : a comparable region of charged particles surrounding another celestial body (such as Venus)

ionospheric

play \ˌī-ˌä-nə-ˈsfir-ik, -ˈsfer-\ adjective

ionospherically

play \ˌī-ˌä-nə-ˈsfir-i-k(ə-)lē, -ˈsfer-\ adverb

Recent Examples of ionosphere from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ionosphere.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of ionosphere

1926

in the meaning defined above

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IONOSPHERE Defined for Kids

ionosphere

noun ion·o·sphere \ ī-ˈä-nə-ˌsfir \

Definition of ionosphere for Students

: the part of the earth's atmosphere beginning at an altitude of about 30 miles (50 kilometers) and extending outward that contains electrically charged particles


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