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Chinese Journal of Space Science ›› 2020, Vol. 40 ›› Issue (6): 980-989.doi: 10.11728/cjss2020.06.980

• Research Articles • Previous Articles    

Simulation of Mean Free Path of Solar Energetic Particles in Three-dimensional MHD Background

WANG Shangjie1,2, WEI Wenwen1,2, LIU Yousheng1,2, ZHU Yuji1,2, SHEN Fang1,2,3   

  1. 1 National Space Science Center, Chinese Academy of Sciences, Beijing 100190;
    2 University of Chinese Academy of Sciences, Beijing 100049;
    3 Institute of Space Science and Applied Technology, Harbin Institute of Technology, Shenzhen 518055
  • Received:2019-04-08 Revised:2020-08-12 Published:2020-12-09

Abstract: The mean free path of SEP is an important parameter in the study of SEP propagation in space physics, which is determined by the physical properties of SEP and solar wind. In this paper, the MHD-SEP model is used to discuss the mean free path under the three-dimensional MHD background field. The advantage of this model is that it has the solar wind background field tending to the real physical model. Two CRs were selected to simulate the high and low years of solar activity, and the spatial changes were qualitatively analyzed, and the correlation between mean free path and radial solar wind speed was studied. The conclusion of the spatial distribution of the mean free equation obtained by this method can be consistent with that obtained by previous scholars, and can be used to qualitatively establish the parallel mean free equation. The model can reflect the different characteristics of the distribution and value of the parallel mean free path in different events. It shows that the average free path depends on the radial direction and has a good negative correlation with the radial solar wind velocity. This work can be used as a reference for future research on the mean free path of SEP.

Key words: MHD, SEP, Mean free path

CLC Number: