ionosphere


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i·on·o·sphere

 (ī-ŏn′ə-sfîr′)
n.
A region of the earth's atmosphere where ionization caused by incoming solar radiation affects the transmission of radio waves. It extends from a height of 70 kilometers (43 miles) to 400 kilometers (250 miles) above the surface.

i·on′o·spher′ic (-sfîr′ĭk, -sfĕr′-) adj.

ionosphere

(aɪˈɒnəˌsfɪə)
n
(Astronomy) a region of the earth's atmosphere, extending from about 60 kilometres to 1000 km above the earth's surface, in which there is a high concentration of free electrons formed as a result of ionizing radiation entering the atmosphere from space. See also D region, E region, F region
ionospheric adj

i•on•o•sphere

(aɪˈɒn əˌsfɪər)

n.
the region of the earth's atmosphere between the stratosphere and the exosphere, consisting of several ionized layers and extending from about 50 to 250 mi. (80 to 400 km) above the surface of the earth.
i•on`o•spher′ic (-ˈsfɛr ɪk) adj.

i·on·o·sphere

(ī-ŏn′ə-sfîr′)
A region of the Earth's atmosphere in which atoms are often ionized (electrically charged) by radiation from the sun. The ionosphere lies mostly in the lower thermosphere, from about 43 to 250 miles (69 to 402.5 kilometers) above the Earth. Radio waves, which normally travel in a straight line, can be transmitted long distances over the curved surface of the Earth because they bounce off certain layers of the ionosphere and return to Earth instead of continuing into space.

ionosphere

That part of the atmosphere, extending from about 70 to 500 kilometers, in which ions and free electrons exist in sufficient quantities to reflect electromagnetic waves.

ionosphere

the outermost part of the earth’s permanent atmosphere, beyond the stratosphere, composed of heavily ionized molecules. It extends from about 50 to 250 miles above the surface of the earth. Cf. exosphere.
See also: Atmosphere

ionosphere

1. The upper layer of the atmosphere that lies above the stratosphere and is about 217 mi (350km) thick.
2. The area of the Earth’s atmosphere in which ionization caused by solar radiation affects the transmission of radio waves.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ionosphere - the outer region of the Earth's atmosphere; contains a high concentration of free electrons
atmosphere, air - the mass of air surrounding the Earth; "there was great heat as the comet entered the atmosphere"; "it was exposed to the air"
D region, D-layer - the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves
Appleton layer, F layer, F region - the highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission
E layer, E region, Heaviside layer, Kennelly-Heaviside layer - a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
region, part - the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space"
Translations
ionosfääri

ionosphere

[aɪˈɒnəsfɪəʳ] Nionosfera f

ionosphere

nIonosphäre f

ionosphere

[aɪˈɒnəˌsfɪəʳ] nionosfera
References in periodicals archive ?
In this case, the cause of the ionosphere disruptions was not determined.
From 1958 through 1995, the average ionosphere height dropped by 8 km, according to the group's report in the Sept.
They also yield important scientific measurements of diverse phenomena in the ionosphere, a region of the earth's atmosphere where ionization caused by solar radiation affects the transmission of radio waves.
PISA is an acronym for the Plasma Impedance Spectrum Analyzer, which will test a new measurement technique for the thermal electron populations in the ionosphere, and their density structuring, which can interfere with or scatter radio signals used for communication and navigation.
Ground-based detectors, however, measured sizable increases in the energy of electrons in Earth's ionosphere, and skywatche rs as far south as Boston were treated to a dazzling auroral display.
HF has the ability to project over mountains and urban areas, bounce off the ionosphere, and come back down, making it extremely useful for over the horizon communications.
It has spent nearly two decades using radio waves to probe Earth's magnetic field and ionosphere.
The pulses race upward, generating light when they reach the ionosphere.
Currently, the ionosphere provides long-range capabilities for commercial ship-to-shore communications, transoceanic aircraft links, and military communications and surveillance systems.
is to be able to predict when and where disturbances [originating from the sun] might occur in [Earth's] magnetosphere and ionosphere and how severe they might be.
The HAARP program collects and assesses data to advance knowledge of the physical and electrical properties of the Earth's ionosphere.
Lyons, Kim and their colleagues analyzed radar data that measure the strength of the interaction by measuring flows in the ionosphere, the part of Earth's upper atmosphere ionized by solar radiation.