ionosphere

noun
ion·​o·​sphere | \ ī-ˈä-nə-ˌsfir How to pronounce ionosphere (audio) \

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)

Other Words from ionosphere

ionospheric \ ˌī-​ˌä-​nə-​ˈsfir-​ik How to pronounce ionosphere (audio) , -​ˈsfer-​ \ adjective
ionospherically \ ˌī-​ˌä-​nə-​ˈsfir-​i-​k(ə-​)lē How to pronounce ionosphere (audio) , -​ˈsfer-​ \ adverb

Examples of ionosphere in a Sentence

Recent Examples on the Web In general, such disturbances in the ionosphere do not harm humans but can affect GPS signals and disrupt aircraft navigation. Kasha Patel, Washington Post, 21 June 2022 These storms can heat the ionosphere – where Earth's atmosphere meets space – causing the beautiful auroras here on Earth. Doyle Rice, USA TODAY, 24 Oct. 2021 The drag comes partly from the way the conductive film interacts with the Earth’s magnetic field and with plasma in the ionosphere, creating an electrodynamic force, said Rob Hoyt, founder and president of Tethers Unlimited, which makes the device. Author: Samantha Masunaga, Anchorage Daily News, 6 July 2021 The drag comes partly from the way the conductive film interacts with the Earth’s magnetic field and with plasma in the ionosphere, creating an electrodynamic force, said Rob Hoyt, founder and president of Tethers Unlimited, which makes the device. Author: Samantha Masunaga, Anchorage Daily News, 6 July 2021 The drag comes partly from the way the conductive film interacts with the Earth’s magnetic field and with plasma in the ionosphere, creating an electrodynamic force, said Rob Hoyt, founder and president of Tethers Unlimited, which makes the device. Author: Samantha Masunaga, Anchorage Daily News, 6 July 2021 During the July flyby nearly 30 years later, data on the ionosphere was gathered six months after the sun's solar minimum. Ashley Strickland, CNN, 4 May 2021 The drag comes partly from the way the conductive film interacts with the Earth’s magnetic field and with plasma in the ionosphere, creating an electrodynamic force, said Rob Hoyt, founder and president of Tethers Unlimited, which makes the device. Author: Samantha Masunaga, Anchorage Daily News, 6 July 2021 The radio signal picked up by FIELDS helped the researchers calculate the density of the Venusian ionosphere. Ashley Strickland, CNN, 4 May 2021 See More

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

History and Etymology for ionosphere

ion or ion(ization) + -o- + -sphere

Note: The term was introduced by the British engineer and physicist Robert A. Watson-Watt (1892-1973), apparently first in an unpublished letter (November 8, 1926) to the secretary of the Radio Research Board, a government agency (see Nature, vol. 224, December 13, 1969, p. 1096). Watson-Watt used it in print in the Quarterly Journal of the Royal Meteorological Society, vol. 55 (1929), p. 278.

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The first known use of ionosphere was in 1926

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Dictionary Entries Near ionosphere

ionosonde

ionosphere

ionotropy

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Last Updated

23 Jun 2022

Cite this Entry

“Ionosphere.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ionosphere. Accessed 9 Aug. 2022.

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More Definitions for ionosphere

ionosphere

noun
ion·​o·​sphere | \ ī-ˈä-nə-ˌsfir How to pronounce ionosphere (audio) \

Kids Definition of ionosphere

: 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

More from Merriam-Webster on ionosphere

Nglish: Translation of ionosphere for Spanish Speakers

Britannica.com: Encyclopedia article about ionosphere

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