ionospheric layer
41Atmospheric electricity — is the regular diurnal variations of the Earth s atmospheric electromagnetic network (or, more broadly, any planet s electrical system in its layer of gases). The Earth’s surface, the ionosphere, and the atmosphere is known as the global… …
42electromagnetic radiation — Physics. radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x rays, and gamma rays. [1950 55] * * * Energy propagated through free space or through a material medium in the form of… …
43Antarctica — /ant ahrk ti keuh, ahr ti /, n. the continent surrounding the South Pole: almost entirely covered by an ice sheet. ab. 5,000,000 sq. mi. (12,950,000 sq. km). Also called Antarctic Continent. * * * Antarctica Introduction Antarctica Background:… …
44K-factor — Telecommunications= In telecommunication, the term k factor has the following meanings: 1. In tropospheric radio propagation, the ratio of the effective Earth radius to the actual Earth radius. Note: The k factor is approximately 4/3. 2. In… …
45Surface wave — Diving grebe creates surface waves In physics, a surface wave is a mechanical wave that propagates along the interface between differing media, usually two fluids with different densities. A surface wave can also be an electromagnetic wave guided …
46Callisto (moon) — Callisto View of the heavily cratered terrain of Callisto s anti Jovian hemisphere obtained in 2001 by NASA s Galileo spacecraft. The large impact structure Asgard is on the limb at upper right. The prominent rayed crater below and just right of… …
47Appleton , Sir Edward Victor — (1892–1965) British physicist Appleton was born in Bradford and studied physics at Cambridge University from 1910 to 1913. During World War I, while he was serving in the Royal Engineers, he developed the interest in radio that was to influence… …
48F 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,… …
49Birkeland current — Schmatic of the Birkeland or Field Aligned Currents and the ionospheric current systems they connect to.[1] A Birkeland current is a set of currents which flow along geomagnetic field line connecting the Earth’s magnetosphere to the Earth s hi …
502008 in spaceflight — |11 January, 05:32 GMT [cite web url= http://sites.wff.nasa.gov/code810/news/story80.html title= 36.243 UG McCandliss/Johns Hopkins University accessdate= 2008 03 15 author= date= 2008 01 11 format= html publisher= NASA Sounding Rockets Office… …
