![]() We find that atmospheric sounds extend measurements of pressure variations down to 1,000 times smaller scales than ever observed before, showing a dissipative regime extending over five orders of magnitude in energy. ![]() Here, using Perseverance microphone recordings, we present the first characterization of the acoustic environment on Mars and pressure fluctuations in the audible range and beyond, from 20 Hz to 50 kHz. However, theoretical models were uncertain because of a lack of experimental data at low pressure and the difficulty to characterize turbulence or attenuation in a closed environment. Models predicted that: (1) atmospheric turbulence changes at centimetre scales or smaller at the point where molecular viscosity converts kinetic energy into heat 1, (2) the speed of sound varies at the surface with frequency 2, 3 and (3) high-frequency waves are strongly attenuated with distance in CO 2 (refs. ![]() Nature volume 605, pages 653–658 ( 2022) Cite this articleīefore the Perseverance rover landing, the acoustic environment of Mars was unknown.
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