ionosphere

i·on·o·sphere  (-n-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·ono·spheric (-sfîrk, -sfr-) 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  [aɪˌɒnəˈsfɛrɪk] adj

---

ionosphere  (-n-sfîr)

A region of the Earth's upper atmosphere, extending from a height of 70 km (43 mi) to 400 km (248 mi) and containing atoms that have been ionized by radiation from the Sun. The ionosphere lies mostly in the lower thermosphere and is subdivided into three regions, the D region (70 km to 90 km; 43 to 56 mi), the E region (90 km to 150 km; 56 to 93 mi), and the F region (150 km to 400 km; 93 to 248 mi). The concentration of ionized atoms is lowest in the D region, intermediate in the E region, and highest in the F region. The ionosphere is useful for radio transmission because radio waves, which normally propagate in straight lines, are reflected off the ionized gas particles, thereby being transmitted long distances across the Earth's curved surface. See more at D regionE regionF region

---

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

---

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.

Thesaurus

Noun

1.

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

ionosphere [aɪˈɒnəsfɪəʳ] N → ionosfera f

ionosphere

n → Ionosphäre f

ionosphere [aɪˈɒnəˌsfɪəʳ] n → ionosfera

---

ionosphere [aɪˈɒnəˌsfɪəʳ] n → ionosfera