行星际空间慢激波的演化  

EVOLUTION OF SLOW SHOCKS IN THE INTERPLANETARY SPACE

作　　者：胡友秋[1] 

机构地区：[1]中国科学技术大学

出　　处：《地球物理学报》1994年第3期275-281,共7页Chinese Journal of Geophysics

基　　金：国家自然科学基金

摘　　要：日心距离０．３ＡＵ以内形成的磁流体慢激波在向行星际空间传播过程中，通过向上游发出快压缩波而不断减弱．所发出的快压缩波经非线性变陡转化为快激波，形成由原慢激波和新生快激波构成的激波系统．强度不断减弱的慢激波将逐渐演变为准切向间断．这可能是在１ＡＵ附近很少观测到慢激波的重要原因．A magnetohydrodynamic slow shock, formed within 0. 3AU and propagating into the interplanetary space, diminishes continuously by launching fast compression waves upstream, which later on become a fast shock through nonlinear steepening process.A shock system occurs as a result. consisting of the original slow shock and the newly developed fast shock. Moreover, the diminishing slow shock gradually evolves into a quasi-tangential discontinuity. This Is probably an important cause for the fact that slow shocks were scarecely observed at 1 AU.

关 键 词：行星际动力学 磁流体力学 

分 类 号：P353.8[天文地球—空间物理学]