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本文采用特征线方法和激波装配法,对磁流体中间激波在行星际空间的演化过程进行数值模拟。主要结论如下:(1) 2→4型中间激波通过向下游发出后向慢压缩波使下游态磁场减幅,通过向上游发出前向快压缩波使上游态磁场增幅,以致2→4型中间激波迅速经导灭激波向慢激波转化;所发出的前向快压缩波经非线性变陡形成快激波。(2)1→3型中间激波首先通过向下游发出前向慢稀疏波而很快变成1→3=4型临界中间激波,并瞬间转变为由前向快激波和前向2→4型中间激波构成的激波系统。其中,2→4型中间激波可在其前导快激波的下游传播较远的距离,有可能为 IAU 附近的飞船观测到,但最终导灭激波转变为慢激波。
In this paper, we use the method of characteristic line and shock-wave assembly method to simulate the evolution process of the intermediate shock in the interplanetary space. The main conclusions are as follows: (1) The type 2 → 4 intermediate shock wave decreases the downstream magnetic field by issuing a slow compressional wave to the downstream and amplifies the upstream magnetic field by sending a forward fast compressional wave upstream, so that the type 2 → 4 The intermediate shock rapidly transforms the slow shock into the slow shock; the forward fast compressional wave generated by the non-linear steep rapid shock wave. (2) The 1 → 3 type intermediate shock quickly changes to a 1 → 3 = 4 critical intermediate shock by first sending a forward slow sparse wave to the downstream and instantaneously transforms into a forward shock 2 and forward 2 → 4 shock wave system consisting of intermediate shock. Among them, 2 → 4 type intermediate shocks can propagate further distances downstream of their leading shock waves, which may be observed by spacecraft near the IAU, but eventually the shock wave leads to slow shock.