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地球与行星物理

ISSN  2096-3955

CN  10-1502/P

Citation: Kai Fan, XinLiang Gao, QuanMing Lu, and Shui Wang, 2021: Study on electron stochastic motions in the magnetosonic wave field: Test particle simulations, Earth and Planetary Physics. http://doi.org/10.26464/epp2021052

doi: 10.26464/epp2021052

Study on electron stochastic motions in the magnetosonic wave field: Test particle simulations

Kai Fan 1,, XinLiang Gao 2,,, QuanMing Lu 1,, and Shui Wang 2,

1 CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Science, University of Science and Technology of China, Hefei 230026, China;

2 CAS Center for Excellence in Comparative Planetology, Hefei 230026, China

Corresponding author: XinLiang Gao, gaoxl@mail.ustc.edu.cn

Fund Project: This research was funded by the Strategic Priority Research Program of Chinese Academy of Sciences Grant No. XDB41000000, the NSFC grant 41774151, 41631071, 41527804, Key Research Program of Frontier Sciences CAS (QYZDJ-SSW-DQC010), USTC Research Funds of the Double First-Class Initiative, the Fundamental Research Funds for the Central Universities, and Young Elite Scientists Sponsorship Program by CAST (2018QNRC001). The data used to generate the figures in this paper can be accessed via the following link (http://doi.org/10.5281/zenodo.4133521).

With the test particle simulation method, we have investigated the stochastic motion of electron with the energy of 300 keV in a monochromatic magnetosonic (MS) wave field, which is motived by the violation of the assumption of quasi-linear theory when the strong MS waves (the amplitude up to ~ 1 nT) are presented in the Earth’s magnetosphere. First of all, the electron motion can become stochastic when the wave amplitude exceeds a certain threshold. If electron initially resonates with MS wave in the way of bounce resonance, as the bounce resonance order increases, the amplitude threshold of electron stochastic motion firstly increases until it reaches the peak at about the 11 order in our study, then the amplitude threshold begins a slow decline. More interestingly, we find that the coexistence of bounce and Landau resonances between electron and MS wave will significantly reduce the amplitude threshold. In some cases, the electron motion can become stochastic in the field of MS wave with amplitudes below 1 nT. Besides, if neither the bounce nor Landau resonance condition is satisfied at the initial, then the amplitude threshold of stochastic motion also shows the increasing trend for lower frequencies and the decreasing trend for higher frequencies, but the amplitude threshold is always very large (> 5 nT). Our study suggests that the electron stochastic motion should also be considered when modeling electron dynamics regulated by intense MS waves in the Earth’s magnetosphere.

Key words: magnetosonic waves, electron stochastic motions, bounce resonances, test particle simulations

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Study on electron stochastic motions in the magnetosonic wave field: Test particle simulations

Kai Fan, XinLiang Gao, QuanMing Lu, and Shui Wang