摘要
Using dynamics equation, acceleration of out-flowing ion during dipolarization in a substorm in the magneto-tail is simulated. The main results show that: (1) The ion distribution function that is initially exponentially decreasing with increasing speed is turned into a single peak distribution, and with time the peak moves towards higher speed. (2) The peak moves along V⊥ faster than that along V||, and the ion acceleration mainly occurs in the middle of the dipolarization. (3) The higher the initial energy, the faster the peak moves, and the more energy is obtained by the ions. The ion energy theoretically calculated is as high as about 102 keV, this is consistent with the observation.
作者
SHI Jian-kui
LIU Zhen-Xing
T.L.Zhang
K.Torkar
更建魁;刘振兴;T.L Zhang;K.Torkar(Center for Space Science&Applied Research,Chinese Academy of Sciences,Beijing 100080;Space Research Institute,Austrian Academy of Sciences,A-8010 Graz,Austria)
基金
the National Natural Science Foundation of China under Grant Nos.49674242 and 49834040。
