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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 duration each.
The sound's source was roughly triangulated to , a remote point in the South Pacific Ocean west of the southern tip of South America The sound was detected by the Equatorial Pacific Ocean autonomous hydrophone array , [ 1 ] a system of hydrophones primarily used to monitor undersea seismicity, ice noise, and marine mammal population and migration.
A 1973 report cites a university study of fifty cases of people complaining about a "low throbbing background noise" that others were unable to hear. The sound, always peaking between 30 and 40 Hz (hertz), was found to only be heard during cool weather with a light breeze, and often early in the morning. These noises were often confined to a 10 ...
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The American Contract Bridge League (ACBL) is a governing body for contract bridge in the United States, Canada, Mexico, and Bermuda. [1] It is the largest such organization in North America having the stated mission "to promote, grow and sustain the game of bridge and serve the bridge-related interests of our Members."
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