Whistler

Whistler
Whistlerian /hwis lear"ee euhn, wis-/, adj.
/hwis"leuhr, wis"-/, n.
James (Abbott) McNeill /meuhk neel"/, 1834-1903, U.S. painter and etcher, in France and England after 1855.

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also called  whistling atmospheric 

      electromagnetic wave propagating through the atmosphere that occasionally is detected by a sensitive audio amplifier as a gliding high-to-low- frequency sound. Initially, whistlers last about half a second, and they may be repeated at regular intervals of several seconds, growing progressively longer and fainter with time. These electromagnetic waves (electromagnetic radiation) originate during lightning discharges and are usually in the frequency range of 300 to 30,000 hertz.

      Whistlers propagate through the ionosphere (ionosphere and magnetosphere) (the portion of the atmosphere where the number of ions is large enough to affect the propagation of radio waves; it begins at a height of about 50 km [30 miles] above the Earth's surface). Traveling along ducts, or regions of enhanced ionization, they pass from one hemisphere to another along the Earth's magnetic field until they are reflected at the corresponding geomagnetic latitude in the opposite hemisphere. The higher-frequency waves propagate faster. The whistle effect occurs because the reflected high-frequency waves arrive at the amplifier before the lower-pitched signals. Repeated reflections, dispersion, and absorption of the waves are responsible for the subsequent fainter and longer whistling tones.

      Studies of whistler propagation have been used to determine electron density at altitudes as high as 19,000 to 26,000 km (12,000 to 16,000 miles), as well as daily, annual, and long-term variations of the electron density in the upper atmosphere.

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Universalium. 2010.

Look at other dictionaries:

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  • WHISTLER (J. A.) — Un caractère tracassier, caustique et le don de la publicité ont procuré à Whistler, peintre et graveur anglo américain, une notoriété qu’il est difficile de dissocier de sa réputation d’artiste. Sa carrière fut semée de scandales et de… …   Encyclopédie Universelle

  • Whistler — (engl. to whistle, „pfeifen“) ist ein Berg in Kanada, siehe Whistler Mountain der Name eines kanadischen Ortes am Fuße des gleichnamigen Berges, siehe Whistler (British Columbia) ein Ort in Alabama (USA), siehe Whistler (Alabama) ein… …   Deutsch Wikipedia

  • Whistler — puede referirse a: Apellido James McNeill Whistler, pintor inglés del siglo XIX Madre de Whistler, uno de sus cuadros James Whistler (personaje de Prison Break) Topónimos Whistler (Columbia Británica) Otros usos Windows Whistler, un desarrollo de …   Wikipedia Español

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  • Whistler — (spr. ŭißler), James Me Neill, amerikan. Maler, geb. 11. Juli 1834 in Lowell (Massachusetts), gest. 17. Juli 1903 in London, verlebte einen Teil seiner Jugend in Petersburg, wo sein Vater als Ingenieur tätig war, besuchte 1851–54 die… …   Meyers Großes Konversations-Lexikon

  • Whistler — Whis tler, n. [AS. hwistlere.] [1913 Webster] 1. One who, or that which, whistles, or produces or a whistling sound. [1913 Webster] 2. (Zo[ o]l.) (a) The ring ousel. (b) The widgeon. [Prov. Eng.] (c) The golden eye. (d) The golden plover and the… …   The Collaborative International Dictionary of English

  • Whistler — Whistler, James, amerik. engl. Bildnismaler und Radierer, geb. 1834 zu Lowell (Massachusetts), Schüler von Gleyre in Paris, gest. 17. Juli 1903 in London. [Tafel: Porträtmalerei II, 10]. – Vgl. Singer (1904) …   Kleines Konversations-Lexikon

  • Whistler — Whistler, James Abbott Mac Neill …   Enciclopedia Universal

  • Whistler — (James Abbott McNeill) (1834 1903) peintre et graveur américain. Ses portraits et paysages tiennent de l impressionnisme et du symbolisme …   Encyclopédie Universelle

  • Whistler — [hwis′lər, wis′lər] James Abbott McNeill [mək nēl′] 1834 1903; U.S. painter & etcher in England …   English World dictionary

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