Observations of infrasonic signals from natural and manmade sources

We report on data recorded from small aperture (20-m) infrasonic microphone arrays. These data will include the well-observed Pennsylvania bolide of 23 July 2001, space shuttle launches, sounding rocket launches, and local severe storm passages. Data were obtained from two infrasonic arrays in southern Maryland. Analysis results from two independent packages will be presented, including bearing estimates and detector performance. Bolide detection results will be correlated with eyewitness reports of the flight trajectory. Estimates will be made of the bolide source energy from the application of the historical explosion scaling law relating the period at maximum acoustic amplitude. Detection of sounding rockets from over 150 km will be discussed. Finally, data from the passage of several severe storms will be presented showing the detection and tracking of a low-frequency acoustic signature of the storm.