F layer
noun Date: 1928 the highest and most densely ionized regular layer of the ionosphere occurring at night within the F region

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • 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

  • 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

  • F-layer — n. the highest and most strongly ionized region of the ionosphere. Etymology: F (arbitrary) + LAYER * * * Fˈ layer noun The highest layer of the ionosphere, in which radio signals are transmitted • • • Main Entry: ↑F …   Useful english dictionary

  • F-layer — noun the highest and most strongly ionized region of the ionosphere. Origin 1920s: arbitrary use of F + layer …   English new terms dictionary

  • F layer — /ˈɛf leɪə/ (say ef layuh) noun the highest of the radio reflective ionospheric layers (about 130 km above the earth), consisting of a lower part detectable in the daytime only, and an upper part (Appleton layer) which, because it is constant, is… …   Australian English dictionary

  • 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 — noun 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 • Syn: ↑Appleton layer, ↑F region • Instance Hypernyms: ↑region,… …   Useful english dictionary

  • F layer — n. phs the highest radio reflective region of the ionosphere, at an altitude of ab. 80 mi. (130 km) • Etymology: 1925–30 …   From formal English to slang

  • F region — /ˈɛf ridʒən/ (say ef reejuhn) noun the ionospheric region in which the F layer forms …   Australian English dictionary

  • F region — The F region of the ionosphere is home to the F layer of ionization, also called the Appleton layer , after the English physicist Edward Appleton. As with other ionospheric sectors, layer implies a concentration of plasma, while region is the… …   Wikipedia

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