the ionospheric region in which the F layer forms.
the highest region of the ionosphere, extending from a height of about 150 kilometres to about 1000 kilometres. It contains the highest proportion of free electrons and is the most useful region for long-range radio transmission Also called Appleton layer See also ionosphere
The highest region of the ionosphere, consisting of free electrons generated by the ionizing effect of solar radiation. This region is subdivided into two layers, designated the F1 layer, and the F2 layer. The F1 layer extends from about 150 km (93 mi) to 240 km (149 mi) above the surface of the Earth and exists only during sunlight hours. At night it merges into the F2 layer. The F2 layer extends from about 240 km (149 mi) to 400 km (248 mi). The density of free electrons in this layer is much higher than it is in the F1 layer. It is the main reflecting layer for high frequency communications, both during sunlight hours and during the night. Also called F layer. See also ionosphere.
[frey] /freɪ/ noun 1. Eduardo [e-dwahr-th aw] /ɛˈdwɑr ðɔ/ (Show IPA), 1911–82, Chilean statesman: president 1964–70.
[frahy-boo rk] /ˈfraɪˌbʊərk/ noun 1. a city in SW Baden-Württemberg, in SW Germany. 2. German name of . /German ˈfraibʊrk/ noun 1. a city in SW Germany, in SW Baden-Württemberg: under Austrian rule (1368–1805); university (1457). Pop: 212 495 (2003 est) Official name Freiburg im Breisgau (ɪm ˈbraisɡau) 2. the German name for Fribourg
Fellowship and Residency Electronic Interactive Database Access System
[freyt] /freɪt/ noun 1. goods, cargo, or lading transported for pay, whether by water, land, or air. 2. the ordinary conveyance or means of transport of goods provided by common carriers (distinguished from ): Shipping by freight is less expensive. 3. the charges, fee, or compensation paid for such transportation: We pay the freight. 4. […]