Propagation of energetic particles accelerated by the interplanetary shock in three dimensional interplanetary magnetic fields

作     者：Yang Wang 1 Gang Qin 1 (1 State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences,Beijing, 100190 ) 

会议名称：《第十四届全国日地空间物理学术研讨会》

会议日期：2011年

学科分类：070802[理学-空间物理学] 07[理学] 0708[理学-地球物理学] 

摘      要：As interplanetary coronal mass ejection （ICME） shock propagates from the sun to a large radial distance, it continuously accelerates particles up to many MeV. Based on a numerical solution of the Fokker-Planck transport equation, we obtained intensity and anisotropy time profiles of interplanetary shock accelerated particles propagating in the three-dimensional Parker interplanetary magnetic field. We describe the shock as a moving source of energetic particles, and treat shock acceleration process as black box. With perpendicular diffusion, the energetic particles moving in the interplanetary space can across field lines. Our simulations show that many important properties of Solar Energetic Particle（SEP） flux, including the onset time, peak time, peak intensity, decay ratio, and duration, are significantly influenced by the effect of perpendicular diffusion. By including the perpendicular diffusion, we reproduce longitudinal and latitudinal uniformity of SEP fluxes. Furthermore, we will compare our numerical results with spacecraft observations.