Complex Propagation of Large Sound Sources in Terrestrial-like Atmospheres and its Application to Bolide Detection

Details Complex Propagation of Large Sound Sources in Terrestrial-like Atmospheres and its Application to Bolide Detection Complex Propagation of Large Sound Sources in Terrestrial-like Atmospheres and its Application to Bolide Detection

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.4516w&link_type=abstract

American Astronomical Society, DPS meeting #38, #45.16; Bulletin of the American Astronomical Society, Vol. 38, p.570

Computer Science

Sound

Scientific paper

We have developed an advanced generalized, acoustic ray-tracing model to capture the behavior of sound (i.e. its radiation pattern and range of detectability) in the complex dynamical systems of the Venus, Earth, Mars, and Titan atmospheres. Sound propagation is affected by the composition, structure, and dynamics of a planet's atmosphere; therefore we have adopted a modular approach so that any hypothetical atmosphere with varying climatic conditions and gas composition can be account for. Our model determines the viscous, thermal, and molecular attenuation in a given multi-gas atmosphere as well as attenuation resulting from suspended aerosols. Given output from a global or meso-scale atmospheric model, we then ray trace the sound path accounting for these properties.
As a specific application, we suggest an in-atmosphere acoustic technique for measuring bolides influx rates (which are currently highly uncertain and significantly affect results of modeled absolute crater retention ages). Bolides [explosions] provide well-characterized, large magnitude, low-frequency sound sources that are common to all planetary atmospheres and should be remotely detectable by acoustic sensors. We present an end-to-end comparison between Venus, Earth, Mars, and Titan by modeling a typical large terrestrial event and the resulting sound propagation in each environment. For each event we determine airburst altitudes, acoustic energy release, sound propagation pattern and the footprint size on the ground. From this we place constraints on the practicality of an in-situ acoustic sensor as a method for direct measurement of bolide influx rates in planetary atmospheres. This work has been supported by the Caltech O. K. Earl Postdoctoral Fellowship.

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