F region
noun Date: 1923 the highest region of the ionosphere occurring from 80 miles (130 kilometers) to more than 300 miles (500 kilometers)

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • F region — n. the highest atmospheric zone within the ionosphere, at an altitude of c. 140 to 400 km ( c. 90 to 250 mi), containing the F layers …   English World 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

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

  • F region — the ionospheric region in which the F layer forms. [1925 30] * * * ▪ atmospheric science       highest region of the ionosphere, at altitudes greater than 160 km (100 miles); it has the greatest concentration of free electrons and is the most… …   Universalium

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

  • F region — The general region of the ionosphere in which the F1 and F2 layers tend to form. See F layer, F1 layer, and F2 layer …   Aviation dictionary

  • région — [ reʒjɔ̃ ] n. f. • 1380; « pays » XIIe; lat. regio « direction; frontière, contrée », de regere 1 ♦ Territoire relativement étendu, possédant des caractères physiques et humains particuliers qui en font une unité distincte des régions voisines ou …   Encyclopédie Universelle

  • F (disambiguation) — F is the sixth letter of the Latin alphabet. F may also refer to:cience*Fahrenheit *Farad, a unit for electric capacitance *Faraday constant *Fluorine *Focal length **f number, the focal length divided by the aperture diameter *Force *FrequencyAs …   Wikipedia

  • 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

  • région de conduction intrinsèque — savojo laidumo sritis statusas T sritis fizika atitikmenys: angl. intrinsic region; i region vok. Eigenleitungsgebiet, n; Eigenleitungszone, f; i Zone, f rus. i область, f; область собственной проводимости, f pranc. région de conduction… …   Fizikos terminų žodynas

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