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地球与行星物理

ISSN  2096-3955

CN  10-1502/P

Citation: Fan, K., Gao, X. L., Lu, Q. M., and Wang, S. (2021). Study on electron stochastic motions in the magnetosonic wave field: Test particle simulations. Earth Planet. Phys., 5(6), 592–600. http://doi.org/10.26464/epp2021052

2021, 5(6): 592-600. doi: 10.26464/epp2021052

SPACE PLASMA PHYSICS

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

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

Received Date: 2020-05-25
Web Publishing Date: 2021-10-15

Using the test particle simulation method, we investigate the stochastic motion of electrons with energy of 300 keV in a monochromatic magnetosonic (MS) wave field. This study is motivated by the violation of the quasi-linear theory assumption, when strong MS waves (amplitude up to ~1 nT) are present in the Earth’s magnetosphere. First, electron motion can become stochastic when the wave amplitude exceeds a certain threshold. If an electron initially resonates with the MS wave via bounce resonance, as the bounce resonance order increases, the amplitude threshold of electron stochastic motion increases until it reaches the peak at about the 11th order in our study, then the amplitude threshold slowly declines. Further, we find that the coexistence of bounce and Landau resonances between electrons and MS waves will significantly reduce the amplitude threshold. In some cases, the electron motion can become stochastic in the field of an MS wave with amplitudes below 1 nT. Regardless, if neither the bounce nor Landau resonance condition is satisfied initially, then the amplitude threshold of stochastic motion shows an increasing trend for lower frequencies and a decreasing trend for higher frequencies, even though the amplitude threshold is always very large (> 5 nT). Our study suggests that 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 resonance; 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, Shui Wang