Accession Number : ADA176804


Title :   Antarctic Atmospheric Infrasound.


Descriptive Note : Final technical rept. 1 Jul 81-30 Sep 84,


Corporate Author : ALASKA UNIV FAIRBANKS GEOPHYSICAL INST


Personal Author(s) : Wilson,Charles R ; McKibben,Bruce N


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA176804


Report Date : Nov 1986


Pagination or Media Count : 262


Abstract : In order to monitor atmospheric infrasonic waves in the passband from 0.1 to 0.01 Hz a digital infrasonic detection system was installed in Antarctica on the Ross Ice shelf near McMurdo Station on McMurdo Sound. An array of seven infrasonic microphones subtending an area of about 35 sg km was operated in Windless Bight. The analog microphone data was telemetered to McMurdo station where the infrasonic date were digitized and subjected to on-line real-time analysis to detect traveling infrasonic waves with periods from 10 to 100 seconds. During the period of operation of the Antartic infrasonic observatory, hundreds of infrasonic signals were detected in association with many natural sources such as the aurora australis, marine storm sea-air interactions, volcanic eruptions, mountain generated lee-wave effects, large meteors and auroral electrojet supersonic motions.


Descriptors :   *INFRASONIC RADIATION , DIGITAL SYSTEMS , METEORS , DETECTORS , REAL TIME , MOTION , WAVE PROPAGATION , SIGNALS , AURORAE , ONLINE SYSTEMS , SUPERSONIC CHARACTERISTICS , TROPOSPHERE , MICROPHONES , ANALOG SIGNALS , TRAVELING WAVES , VOLCANOES , OBSERVATORIES , ELECTROJETS


Subject Categories : Meteorology


Distribution Statement : APPROVED FOR PUBLIC RELEASE