Influence of tail-like magnetic field on O~+ ion distribution in the martian magnetosphere

摘要

Based on the comparison with the Earth, using the LB magnetic field model, the distribu- tion of O~+ ion originating from the ionosphere in the Martian magnetosphere is theoretically studied un- der different conditions of the tail-like magnetic field. The results show that the Tail-like magnetic field has influence on the O~+ ion flux in the Martian magnetic: (I) the O~+ ion flux in the martian tail will increase if the tail-like magnetic filed increases; when the tail-like magnetic field increases from 5 nt to 20 nT, the O~+ ion flux increases 3 times in the region of 2.8 R_m in the martian tail; and (II) the O~+ ion flux decreases with increasing intrinsic moment; when the intrinsic moment increases about 5 times, the flux decreases to one fourth in the region of 2.8 R_m in th emartian tail.