Infrasound from a radar-observed meteor

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Abstract
The shock wave produced by the hypersonic entry of a sufficiently large meteoroid into the earth's atmosphere should be detectable at ground level. An array of microbarographs operated at Springhill Meteor Observatory recorded pressure waves on December 14, 1974, believed to be associated with a large meteor detected by the Springhill radars. The time interval between the radar observation and the detection of pressure waves is consistent with an acoustic travel time from the location of the radar echo. Estimates of the meteor mass from the radar echo duration agree with mass estimates calculated from the blast–wave theory of ReVelle. Because no azimuth information was available for the meteor to compare with direction of arrival of the pressure waves, the association is not absolutely certain.

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