Article Dans Une Revue Earth and Planetary Science Letters Année : 2023

Measurements of sound propagation in Mars' lower atmosphere

Ricardo Hueso
Claire Newman

Résumé

Acoustics has become extraterrestrial and Mars provides a new natural laboratory for testing sound propagation models compared to those ones on Earth. Owing to the unique combination of a microphone and two sound sources, the Ingenuity helicopter and the SuperCam laser-induced sparks, the Mars 2020 Perseverance rover payload enables the in situ characterization of unique sound propagation properties of the low-pressure CO2-dominated Mars atmosphere. In this study, we show that atmospheric turbulence is responsible for a large variability in the sound amplitudes from laser-induced sparks. This variability follows the diurnal pattern of turbulence. In addition, acoustic measurements acquired over one Martian year reveal a variation of the sound intensity by a factor of 1.8 from a constant source due to the seasonal cycle of pressure and temperature that significantly modifies the acoustic impedance and shock-wave formation. Finally, we show that the evolution of the Ingenuity tones and laser spark amplitudes with distance is consistent with one of the existing sound absorption models, which is a key parameter for numerical simulations applied to geophysical experiments on CO2-rich atmospheres. Overall, these results demonstrate the potential of sound propagation to interrogate the Mars environment and will therefore help in the design of future acoustic-based experiments for Mars or other planetary atmospheres such as Venus and Titan.

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insu-04473167 , version 1 (22-02-2024)

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Baptiste Chide, Xavier Jacob, Andi Petculescu, Ralph D. Lorenz, Sylvestre Maurice, et al.. Measurements of sound propagation in Mars' lower atmosphere. Earth and Planetary Science Letters, 2023, 615, ⟨10.1016/j.epsl.2023.118200⟩. ⟨insu-04473167⟩
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