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The SOFAR channel (short for sound fixing and ranging channel), or deep sound channel (DSC), is a horizontal layer of water in the ocean at which depth the speed of sound is at its minimum. The SOFAR channel acts as a waveguide for sound, and low frequency sound waves within the channel may travel thousands of miles before dissipating. An example was reception of coded signals generated by the Navy chartered ocean surveillance vessel Cory Chouest off Heard Island, located in the southern Indian Ocean (between Africa, Australia and Antarctica), by hydrophones in portions of all five major ocean basins and as distant as the North Atlantic and North Pacific.

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rdf:type
rdfs:label
  • Kanál SOFAR (cs)
  • SOFAR-Kanal (de)
  • Canal SOFAR (es)
  • Canal SOFAR (fr)
  • Canale SOFAR (it)
  • 소파 채널 (ko)
  • 深海サウンドチャネル (ja)
  • SOFAR channel (en)
  • Canal SOFAR (pt)
  • Подводный звуковой канал (ru)
  • SOFAR通道 (zh)
rdfs:comment
  • Kanál SOFAR (Sound Fixing and Ranging channel), je horizontální vrstva vody v oceánu v níž je rychlost šíření zvuku minimální. Kanál tak slouží jako vlnovod pro zvuk a nízké frekvence zvukových vln v něm mohou cestovat tisíce kilometrů než se ztratí. Tento jev má důležité aplikace především ve vojenství. Kanál SOFAR byl objeven v roce 1940 nezávisle a . (cs)
  • Der SOFAR-Kanal (SOund Fixing And Ranging) ist eine Zwischenschicht im Ozean, in der sich dort ausgesandter Wasserschall über weite Strecken ausbreiten kann, ähnlich wie in einem Wellenleiter. (de)
  • El canal SOFAR por sus siglas en inglés (Sound Fixing and Ranging channel), o canal de sonido profundo, es una capa horizontal de agua en el océano en cuya profundidad la velocidad de sonido es mínima.​ El canal SOFAR actúa como guía de onda para el sonido, y para las ondas sonoras con baja frecuencia que se encuentran en el canal pueden viajar miles de millas antes de disiparse.​ El canal de sonido profundo se describió de forma independientemente por Maurice Ewing, Stanley Wong y Leonid Brekhovskikh en 1940.​ (es)
  • Le canal SOFAR, pour Sound Fixing and Ranging, ou deep sound channel (DSC, canal sonore profond), est une couche d’eau horizontale dans la mer, à la profondeur de laquelle la vitesse du son est à son minimum. Le canal SOFAR agit comme un guide d’ondes pour le son, et les ondes sonores de basse fréquence qui s’y trouvent peuvent voyager sur plusieurs milliers de kilomètres avant de se dissiper. Ce phénomène constitue un facteur important dans la lutte anti-sous-marine. Ce canal sonore profond a été découvert et décrit indépendamment par Maurice Ewing, Stanley Wong et Leonid Brekhovskikh dans les années 1940. (fr)
  • 소파 채널(SOFAR channel:short for Sound Fixing and Ranging channel)또는 DSC(deep sound channel)은 음속이 최소가 되는 바다 안의 수평층이다. 조건에 따라 변하지만 600~1200M 사이에 존재한다. 음파는 온도와 압력에 영향을 받는다. 음파는 해수면과 가까운 곳에서 온도에 큰 영향을 받으므로 아래로 굴절된다. 더 아래에서는 압력의 영향으로 위로 굴절된다. 온도가 급격하게 변하는 수온약층에서는 온도가 낮아짐에 따라 음파는 아래로 굴절되지만, 압력이 증가함에 따라 바로 다시 위로 굴절되고 다시 아래로 굴절되는 현상이 이어진다.또한 음은 세 방향으로 퍼지지 않고 좌우로만 퍼진다. 즉 음파는 음속최소층으로 끈임없이 굴절하여 소파 채널 안에 갇히게 된다. 소파 채널에서 발생한 소리는 특히 먼 거리를 이동한다. 소파 채널은 1940년대에 박사와 박사가 발견하였다. (ko)
  • 深海サウンドチャネル(英語: deep sound channel, DSC)は、サウンドチャネルのうち、音速が極小となる深度が水温躍層と深海等温層の境界によって形成されているもの。SOFARチャネル(英: SOFAR channel)とも称される。 (ja)
  • O canal SOFAR (sound fixing and ranging channel), ou canal DSC (deep sound channel), é uma região de águas profundas no oceano, centrado sobre o local onde a velocidade do som é mínima. O canal SOFAR atua como um guia de ondas para a acústica e ondas de som de baixa freqüência. Dentro do canal elas podem viajar milhares de milhas antes de dissiparem-se. Esse fenômeno é um fator importante na guerra submarina. O canal de som profundo foi descoberto e descrito independentemente pelo Dr. Maurice Ewing e na década de 1940. (pt)
  • SOFAR通道(SOFAR channel),也称深海低频声学通道(deep sound channel),是海洋中低频声音传播的一个区间。在这个通道中的低频声波能以最小的能量衰减传递很远的距离。 (zh)
  • The SOFAR channel (short for sound fixing and ranging channel), or deep sound channel (DSC), is a horizontal layer of water in the ocean at which depth the speed of sound is at its minimum. The SOFAR channel acts as a waveguide for sound, and low frequency sound waves within the channel may travel thousands of miles before dissipating. An example was reception of coded signals generated by the Navy chartered ocean surveillance vessel Cory Chouest off Heard Island, located in the southern Indian Ocean (between Africa, Australia and Antarctica), by hydrophones in portions of all five major ocean basins and as distant as the North Atlantic and North Pacific. (en)
  • Il canale SOFAR (Sound Fixing and Ranging channel, "canale di fissazione ed oscillazione sonora"), o canale sonoro profondo, CSP (deep sound channel, DSC), è uno strato orizzontale di acqua nell'oceano ad una profondità in cui la velocità del suono è minima. Il canale SOFAR agisce come una guida d'onda per il suono, e le onde sonore a bassa frequenza all'interno del canale possono viaggiare per migliaia di miglia prima di dissiparsi. Questo fenomeno è un importante fattore nella . Il canale sonoro profondo fu scoperto e descritto indipendentemente da e negli anni 1940. (it)
  • Подводный звуковой канал — слой воды в морях и океанах, в котором возможно сверхдальнее вследствие рефракции. На некоторой глубине под поверхностью воды (в районе Бермудских островов около 1000 м, к широте 60° достигает поверхности), находится слой, в котором звук распространяется с наименьшей скоростью; выше этой глубины скорость звука увеличивается из-за повышения температуры, а ниже — вследствие увеличения гидростатического давления с глубиной. Используется горбатыми китами для коммуникации на расстояниях, достигающих тысяч километров. (ru)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Underwater_speed_of_sound.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Bathymetry-SOFAR_channel_axis—Heard_Island_Feasibility_Test.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/PARKA_I_Track_Acoustic_Enfironment_-_Kaneohe-Alaska_SOFAR_Channel.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Rays_test.gif
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