Computer Science – Sound
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p11a0351w&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P11A-0351
Computer Science
Sound
5494 Instruments And Techniques, 6225 Mars, 6240 Meteorites And Tektites
Scientific paper
Planetary acoustics has been relatively unexplored on planets other than Earth yet has the potential to provide equally convenient remote measurement techniques and to yield equally rich scientific data sets. We present the first generalized planetary acoustic, ray-tracing model which takes into account environmental conditions and viscous, thermal, and molecular relaxation of multi-gas atmospheres. We show a specific Martian application to making use of terrestrial techniques for bolide detection and influx estimates, and introduce concepts for identifying and tracking general sound sources such as dust devils. Meteors penetrating deep into the terrestrial atmosphere are known to generate large well-characterized acoustics signals. Similar explosive events provide acoustic sources in the Martian atmosphere that should be detectable by sensors on the surface. We present an end-to-end comparison between Earth and Mars of a meteor event from the bolide's entry, through detonation and acoustic transmission of the shockwave, to what is heard by ground detectors (this includes intensity, frequency response, and region of detectability). With the use of an array of detectors detonation events can be spatially localized. We place constraints on the practicality of an instrument and compare with equivalent seismic meteor detection. This analysis leads to a measurement method for estimating bolide influx rates in the Martian atmosphere. This rate is currently highly uncertain and significantly affects results of modeled absolute crater retention ages. Pending work includes the application of similar acoustic localization techniques to develop an instruments concept for the detection and tracking of dust devils such as those observed in both Pathfinder and Mars Global Surveyor images. Further, with minimal reconfiguration, our model and the above analysis can also be applied to Venus and Titan.
McEwan I. J.
Williams Jedediyah
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