标题： 部分电离日球层等离子体中的线性模态 显示英文标题

标题： Linear modes in the partially ionized heliosphere plasma

摘要： 太阳圈主要是一种部分电离的等离子体，由电子、离子和大量中性原子组成。 这些组分之间通过直接碰撞或电荷交换过程发生非线性相互作用。 这些相互作用改变了等离子体的线性和非线性特性。 在本工作中，我们建立了一个一维线性理论来研究这种系统中的线性不稳定性。 在我们的模型中，电子和离子由一个单流体可压缩磁流体动力学（MHD）模型描述，并通过可压缩流体力学方程与中性流体自洽地耦合。 耦合由电荷交换过程介导。 基于我们的自洽分析，我们发现电荷交换耦合在较大尺度上更有效，而阿尔芬波不受电荷交换耦合的影响。 相比之下，快模和慢模波被线性地不稳定驱动。 显示英文摘要

摘要： The heliosphere is predominantly a partially ionized plasma that consists of electrons, ions and significant neutral atoms. Nonlinear interactions amongst these species take place through direct collision or charge exchange processes. These interactions modify linear and non linear properties of the plasma. In this work, we develop a one dimensional linear theory to investigate linear instabilities in such system. In our model, the electrons and ions are described by a single fluid compressible magnetohydrodynamic (MHD) model and are coupled self-consistently to the neutral fluid via compressible hydrodynamic equations. The coupling is mediated by the charge exchange process. Based on our self-consistent analysis, we find that the charge exchange coupling is more effective at larger length scales, and Alfv\'en waves are not affected by the charge exchange coupling. By contrast, the fast and slow waves are driven linearly unstable.