2024-06-18 06:00:10
Discovering how sound behaves on Mars could hold many surprises.
NASA’s Perseverance rover, equipped with multiple microphones, has captured sounds on Mars, including the murmur of dust devils. These recordings revealed a notable peculiarity: Sounds below 240 hertz travel more slowly than high-pitched sounds, due to the carbon-rich atmosphere. carbon dioxide.
Researchers have set out to study the speed and attenuation of sound in the first 20 meters of the Martian atmosphere. By analyzing the data From the Mars climate base, they were able to predict sound variations according to the atmospheric pressurethe temperature and chemical composition.
The study showed that the speed of sound and its attenuation vary greatly on Mars depending on altitude and time of day. For example, in the polar regions, temperatures can fluctuate by 60 degrees Celsius, significantly affecting sound propagation.
The results, published in JGR: Planetsalso revealed that dust does not affect sound propagation, contrary to what one might think. The speed of sound increases with temperature, similar to what happens on Terrebut the dioxide of carbone plays a major role in these variations on Mars.
Daily temperature fluctuations, particularly marked in the areas explored by Perseverance, influence sound propagation. During warmer hours, sounds travel faster and fade more quickly, contrasting with colder hours.
A composite panorama of Mars taken by NASA’s Curiosity rover at two different times of day: 8:30 a.m. and 4:10 p.m. local Martian time. New research shows that sound travels differently at different times of day on Mars, as well as at different times of theyear and in different places.
Credit: ASA/JPL-Caltech
This acoustic modeling can predict the speed and attenuation of sound on Mars at any location and time. For future Martian colonists, this means that mornings on mountaintops could offer a sound experience similar to that on Earth, while afternoons could produce confusing sound effects.
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