Sci-Tech

Chinese and foreign teams' hear 'distant space combined sound waves

2025-01-24   

Liu Chengming and his collaborators from the team led by Academician Cao Jinbin from the School of Space and Earth Sciences at Beihang University have for the first time heard the sound of distant Earth's space. This work breaks the traditional view in academia that synthetic sound waves can only occur in the near Earth region controlled by the Earth's dipole magnetic field, which has lasted for more than 70 years, and elucidates a new mechanism for the generation of synthetic sound waves - nonlinear wave particle interactions. The relevant results were published in the journal Nature on January 23rd. The magnetic field lines of the Earth's space geomagnetic field are like strings fixed at both ends in the north-south magnetic pole region of the Earth. When solar wind energy enters the Earth's magnetosphere and triggers these strings through relevant physical processes, it will excite electromagnetic waves with frequency characteristics similar to the chorus of birds in the morning, which the scientific community calls "harmony". Through nearly 70 years of satellite observation and theoretical research, people have gained a comprehensive understanding of composite sound waves. It has been found that composite sound waves mainly occur in the dipole magnetic field region near Earth. However, due to the complexity of related space plasma physical processes, the generation and propagation mechanism of composite sound waves is still controversial and there is no consensus until today. An international team led by Beihang University and involving colleagues from the United States and Sweden analyzed the massive data collected by the International Multiscale Satellite (MMS) in the Earth's magnetosphere over several years. For the first time, they discovered a composite sound wave in distant space over 160000 kilometers away from Earth and provided a theoretical explanation for the occurrence of this composite sound wave due to nonlinear wave particle interactions. We observed that the frequency of the synthesized sound wave is less than 100 hertz, which is within the range of sound wave frequencies that humans can hear. After converting it into audio output, we obtain a segment of 'space synthesized sound' that we can hear The first author of the paper and associate professor at Beihang University, Liu Chengming, said, "This sound is not only like bird chirping, but also somewhat like the space whale song in science fiction works." Professor Richard Horn, a member of the Royal Society, pointed out in the commentary that the newly discovered composite sound wave is a surprising result that appears in a surprising region. Meanwhile, the first observed phase space electron hole is an extraordinary discovery. The work of Liu Chengming and others will deepen our understanding of composite sound waves and greatly improve our ability to predict high-energy electron radiation bands

Edit:He Chuanning Responsible editor:Su Suiyue

Source:Sci-Tech Daily

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