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  2. List of unexplained sounds - Wikipedia

    en.wikipedia.org/wiki/List_of_unexplained_sounds

    See media help. Upsweep is an unidentified sound detected on the American NOAA's equatorial autonomous hydrophone arrays. This sound was present when the Pacific Marine Environmental Laboratory began recording its sound surveillance system, SOSUS, in August 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds in ...

  3. SOFAR channel - Wikipedia

    en.wikipedia.org/wiki/SOFAR_channel

    The SOFAR channel (short for sound fixing and ranging channel), or deep sound channel (DSC), [1] 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.

  4. Unihemispheric slow-wave sleep - Wikipedia

    en.wikipedia.org/wiki/Unihemispheric_slow-wave_sleep

    Unihemispheric slow-wave sleep (USWS) is sleep where one half of the brain rests while the other half remains alert. This is in contrast to normal sleep where both eyes are shut and both halves of the brain show unconsciousness. In USWS, also known as asymmetric slow-wave sleep, one half of the brain is in deep sleep, a form of non-rapid eye ...

  5. Underwater acoustics - Wikipedia

    en.wikipedia.org/wiki/Underwater_acoustics

    Underwater acoustics (also known as hydroacoustics) is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water, its contents and its boundaries. The water may be in the ocean, a lake, a river or a tank. Typical frequencies associated with underwater acoustics are between 10 ...

  6. Ambient music - Wikipedia

    en.wikipedia.org/wiki/Ambient_music

    Ambient house is a musical category founded in the late 1980s that is used to describe acid house featuring ambient music elements and atmospheres. [ 73 ] Tracks in the ambient house genre typically feature four-on-the-floor beats, synth pads, and vocal samples integrated in an atmospheric style. [ 73 ]

  7. Slow-wave sleep - Wikipedia

    en.wikipedia.org/wiki/Slow-wave_sleep

    Slow-wave sleep (SWS), often referred to as deep sleep, is the third stage of non-rapid eye movement sleep (NREM), where electroencephalography activity is characterised by slow delta waves. [ 2 ] Slow-wave sleep usually lasts between 70 and 90 minutes, taking place during the first hours of the night. [ 3 ]

  8. Sleep in fish - Wikipedia

    en.wikipedia.org/wiki/Sleep_in_fish

    The researchers who documented this behaviour called it "sleep-swimming". [31] Sleep could also be absent during specific parts of a fish's life. Species normally quiescent at night become active day and night during the spawning season. [1] Many parental species forego sleep at night and fan their eggs day and night for many days in a row.

  9. Sofar bomb - Wikipedia

    en.wikipedia.org/wiki/Sofar_bomb

    Sofar bomb. In oceanography, a sofar bomb (Sound Fixing And Ranging bomb), occasionally referred to as a sofar disc, [1] is a long-range position-fixing system that uses impulsive sounds in the deep sound channel ( SOFAR channel) of the ocean to enable pinpointing of the location of ships or crashed planes. The deep sound channel is ideal for ...

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