标题： 表征火星多组分等离子体环境中的离子声波冲击波碰撞 显示英文标题

标题： Characterizing ion-acoustic shock wave collisions in Martian multicomponent plasma environments

摘要： 我们对火星多组分等离子体中碰撞的离子声波（IA）激波进行了理论研究，该等离子体由氢（$H^+$）离子、氧（$O^+$）离子和氧分子（$O_2^+$）离子组成，包括背景超热电子（用$\kappa$-（kappa）分布函数建模）。通过采用改进的Poincaré-Lighthill-Kuo（PLK）摄动方法，得到一组Burgers方程，以描述耗散非线性IA波结构的正面碰撞动力学。我们利用MAVEN探测器在火星大气中通常观测到的参数估计了时空尺度，理论上预期在多组分等离子体中激波会发生相互碰撞。探讨了正面碰撞对由一次和两次IA激波相互作用产生的静电势分布的影响。我们的数值分析表明，碰撞导致激波结构明显展宽，并伴随着运动粘度的增强。 显示英文摘要

摘要： We present theoretical investigation of colliding ion-acoustic (IA) shock waves in Martian multicomponent plasmas consisting of hydrogen ($H^+$), oxygen ($O^+$) and oxygen molecule ($O_2^+$) ions, including background superthermal electrons (modeled by a $\kappa$-(kappa) distribution function). A set of Burgers' equations is obtained by adopting a modified Poincar\'e-Lighthill-Kuo (PLK) perturbation method to describe the head-on-collision dynamics of dissipative nonlinear IA wave structures. We have estimated the spatio-temporal scales using parameters typically observed in the Martian atmosphere by the MAVEN spacecraft, for which shock waves are theoretically expected to undergo mutual collisions in the multicomponent plasma. The effects of head-on collisions on the electrostatic potential profiles arising from one-fold and two-fold IA shock interactions are explored. Our numerical analysis reveals that the collision leads to a noticeable broadening of the shock structures with the enhancement of kinematic viscosity.