A model for the vertical sound speed and absorption profiles in Titan's atmosphere based on Cassini-Huygens data

The Journal of the Acoustical Society of America
Andi Petculescu, Peter Achi

Abstract

Measurements of thermodynamic quantities in Titan's atmosphere during the descent of Huygens in 2005 are used to predict the vertical profiles for the speed and intrinsic attenuation (or absorption) of sound. The calculations are done using one author's previous model modified to accommodate non-ideal equations of state. The vertical temperature profile places the tropopause about 40 km above the surface. In the model, a binary nitrogen-methane composition is assumed for Titan's atmosphere, quantified by the methane fraction measured by the gas chromatograph/mass spectrometer (GCMS) onboard Huygens. To more accurately constrain the acoustic wave number, the variation of thermophysical properties (specific heats, viscosity, and thermal conductivity) with altitude is included via data extracted from the NIST Chemistry WebBook [URL webbook.nist.gov, National Institute of Standards and Technology Chemistry WebBook (Last accessed 10/20/2011)]. The predicted speed of sound profile fits well inside the spread of the data recorded by Huygens' active acoustic sensor. In the N(2)-dominated atmosphere, the sound waves have negligible relaxational dispersion and mostly classical (thermo-viscous) absorption. The cold and dense environment o...Continue Reading

References

Feb 12, 2005·The Journal of the Acoustical Society of America·Andi G Petculescu, Richard M Lueptow
Dec 2, 2005·Nature·M K BirdG L Tyler
Nov 21, 2008·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Tetsuya Tokano

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Citations

Dec 17, 2014·The Journal of Chemical Physics·Robert HellmannVelisa Vesovic
Sep 3, 2016·The Journal of the Acoustical Society of America·Andi Petculescu
Sep 3, 2016·The Journal of the Acoustical Society of America·T G LeightonP R White
Aug 6, 2020·The Journal of the Acoustical Society of America·Adam J Trahan, Andi Petculescu

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