Volume 41 Issue 5
Sep.  2021
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Article Navigation >  Chinese Journal of Space Science  > 2021  >  41(5): 715-723
CHU Wei, QIN Gang, XU Song, HUANG Jianping, ZEREN Zhima, SHEN Xuhui. Study on the Position Diffusion Coefficients of Fokker Planck Equation of Magnetosphere Energetic Particle[J]. Chinese Journal of Space Science, 2021, 41(5): 715-723. doi: 10.11728/cjss2021.05.715
Citation: CHU Wei, QIN Gang, XU Song, HUANG Jianping, ZEREN Zhima, SHEN Xuhui. Study on the Position Diffusion Coefficients of Fokker Planck Equation of Magnetosphere Energetic Particle[J]. Chinese Journal of Space Science, 2021, 41(5): 715-723. doi: 10.11728/cjss2021.05.715
shu

Study on the Position Diffusion Coefficients of Fokker Planck Equation of Magnetosphere Energetic Particle

doi: 10.11728/cjss2021.05.715 cstr: 32142.14.cjss2021.05.715

  • 1. National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing 100085;

  • 2. School of Science, Harbin Institute of Technology, Shenzhen 518055

  • Received Date: 2020-07-21
  • Rev Recd Date: 2021-05-20
  • Publish Date: 2021-09-15
    Abstract
  • In this paper, the quasi-linear theory is used to calculate the diffusion coefficients of the Fokker Planck equation of energetic particles in the observable phase space, and the comparison with the adiabatic invariant radial diffusion coefficients is carried out. The main findings are as follows. The diffusion coefficients of the position items will increase rapidly with the radial distance. Under the same radial distance, the diffusion coefficient of the position items in the high latitude will be smaller than that in the low latitude. Compared with the radial diffusion coefficient, it is found that the two have the same magnitude, but the relative size of the two needs to be analyzed according to the specific disturbance form. This study will use the test particles to simulate the motion of energetic particles in the magnetosphere, especially the guidance center theory, and use the Monte Carlo method of stochastic partial differential to solve the Fokker Planck equation of the motion of energetic particles in the magnetosphere.

     

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