Trajectory Method of 3D Test Particles in Global Transport in Magnetosphere

Based on the theory of magnetospheric particle dynamics and the trajectory method of 3D test particles,we firstly verified charged particles' dynamic characters under a dipole field model for the inner magnetosphere situation(r 8R_e).Then,using a global MHD model as the magnetospheric background,the trajectory method of 3D test particles is employed to investigate the injection of solar wind ions into the magnetosphere during the southward IMF,and to simulate several different typical situations of the injection of the particle into the cusp region during the northward IMF.The simulation results not only reveals the possible processes of the particle injection into the cusp region for northward IMF,but also indicates the general distribution of the particles originally from the solar wind in the magnetosheath and magnetosphere,and the dawn-dusk asymmetry of the particles' density during the southward IMF.The simulation results are coincident with the theory and observation of magnetospheric dynamics.And for the first time,it is indicated by numerical simulation that an atypical magnetic mirror near the polar cusp region plays an important role in the particles' injection from the cusp region to ring current region during northward IMF.