China News Service, Beijing, April 2 (Reporter Sun Zifa) Mars, also one of the planets in the solar system, has long been one of the hot spots of human attention and research on Earth.
Is there any sound on Mars?
What kind of sound is there?
Also a curious question.
The world-renowned academic journal "Nature" recently published a planetary science research paper. Through the acoustic measurement analysis of the Martian sounds detected by the "Perseverance" Mars rover, the researchers revealed the difference between the two sounds in the atmosphere dominated by carbon dioxide. speed.
The results of these studies of Martian sounds detected by the Perseverance rover suggest that sound measurements may help study planetary atmospheres and improve the possibility of understanding the acoustic environment of other planets.
Acoustic recordings on planets may provide insight into the source of sound and the atmosphere through which it travels, the paper said.
Past Mars missions have attempted to record sound, but have been unsuccessful.
The microphone on the Mars Polar Lander was lost as it entered the Martian atmosphere, and the spacecraft microphone on the Phoenix Mars rover suffered technical difficulties.
In the paper, Sylvestre Maurice and colleagues from the French Centre for Astrophysics Research, the University of Toulouse, CNRS, CNES and colleagues report that Perseverance For the first time, the rover's microphones provided a characterization of the Martian acoustic environment in the audible and inaudible range (frequency from 20 Hz to 50 kHz), and a total of 4 hours and 40 minutes of Martian sounds were analyzed, including wind-induced Air turbulence, the sound of sparks as the probe splits rocks with lasers to study planetary chemistry, and other noises from the probe's machinery.
They noted that Perseverance's microphones, which detect changes in wind speed based on changes in sound intensity, revealed pressure fluctuations with frequencies greater than 20 hertz, which had never been detected on Mars before.
At the same time, the speed of sound at different frequencies can be measured by direct analysis of the sound produced by the laser and by the "Intuit" helicopter (a small robotic helicopter) on the Perseverance rover: high-frequency sound waves (frequency 2 kilohertz and above) at speeds between 246-257 meters per second, while the lower frequency sound waves (about 84 Hz) generated by the blades of the "Intuit" helicopter have an estimated speed of 240 meters per second.
These measurements are consistent with predicted velocities based on knowledge of Martian pressure and carbon dioxide's sound-attenuating properties.
The authors concluded that further measurements of wind speed over time and seasons may provide more insights into changes in the Martian atmosphere, and the recorded sounds from the lander could be used to check the rover's systems.
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