F2 layer
noun Date: 1933 the upper of the two layers into which the F region of the ionosphere splits in the daytime at varying heights from about 120 miles (200 kilometers) to more than 300 miles (500 kilometers) above the earth

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • F2 layer — The upper layer of the ionosphere, it lies between 110 to 210 miles (180–350 km). The F2 layer is more persistent than the F1 layer. Its height varies in summers and winters as well as during the days and nights. It affects daytime propagation… …   Aviation dictionary

  • f2 layer — ˈef|tü noun Usage: capitalized F : the upper and usually more densely ionized of the two layers into which the F region of the ionosphere splits in the daytime, occurring at varying heights from about 150 to 250 miles or more above the earth s… …   Useful english dictionary

  • F2 layer — /ef tooh /. See under F layer. * * * …   Universalium

  • F2 — F2, F02, F.II, F.2, F 2 or F 2 may refer to : * F 2, a psychedelic drug * F2, the chemical formula for fluorine gas * F 2 Banshee, a carrier based jet fighter aircraft of the 1950s * F 2 Hägernäs, a former Swedish Air Force wing * F2 hybrid, a… …   Wikipedia

  • F layer — An ionized layer of atmosphere located approximately 90 to 240 miles (150–400 km) above the earth. This layer plays an important role in radio communications and reflects electromagnetic emissions from 1.5 to above 30 MHz. The height of the F… …   Aviation dictionary

  • ионизированный слой f2 — слой f2 По ГОСТ 24375 80 [ГОСТ 25645.113 84] Тематики ионосфера земли Обобщающие термины структура и характеристики ионосферы Синонимы слой f2 EN ionized f2 layer FR couche f2 ionisée …   Справочник технического переводчика

  • F layer — Physics. the highest of the radio reflective ionospheric layers, beginning at an altitude of ab. 80 mi. (130 km) and consisting of two parts, the lower part (F1 layer) being detectable in the daytime only, the higher (F2 layer or Appleton layer)… …   Universalium

  • F layer — n. the two dense layers of ions in the F region of the ionosphere that are used to reflect long range radio signals: the F1 layer, at an altitude of c. 200 to 300 km ( c. 125 to 185 miles), exists during the day, and the permanent F2 layer, or… …   English World dictionary

  • G layer — A part of the ionosphere. This is the layer of free electrons that is occasionally observed above the F2 layer. The layer is at a height of approximately 240 miles (400 km) above the surface of the earth …   Aviation dictionary

  • Appleton layer — n. [after Sir Edward Appleton (1892 1965), Eng scientist] the F2 layer of the ionosphere: see F LAYER …   English World dictionary

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