Abstract
Infrasonic waves can propagate thousands of kilometers in range and sample regions of the atmosphere from the ground up to and including the thermosphere. In this study, seasonal changes in the atmosphere and their effect on infrasonic propagation are characterized. The NASA/NRL empirically based models HWM-93 (for winds) and MSIS-90 (for temperature) are used. Three-dimensional ray traces are computed through the modeled atmosphere for several representative scenarios. Seasonal trends in both ray arrival times and ray azimuth bias are computed, and limited comparisons with data are made where possible. [Sponsored by Defense Threat Reduction Agency, Contract No. DSWA01-97-C-0160.]
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