太阳风电子动力学不稳定性  

Electron Kinetic Instabilities in the Solar Wind

作　　者：孙何雨 SUN He-yu(College of Science,Chongqing University of Posts and Telecommunications,Chongqing 400065)

机构地区：[1]重庆邮电大学理学院,重庆400065

出　　处：《天文学报》2023年第3期103-115,共13页Acta Astronomica Sinica

基　　金：重庆邮电大学科研启动基金项目(E011A2022320)资助。

摘　　要：电子是太阳风粒子中最为重要的组分之一,它可以通过多种机制对太阳风产生影响.太阳风中的电子通常具有温度各向异性和束流两种非热平衡分布特征,这些偏离热平衡分布的特征可以通过波粒相互作用激发电子不稳定性和等离子体波动,激发的等离子体波动又可以通过波粒相互作用调制太阳风粒子的分布,从而加热太阳风中的背景粒子.因此电子动力学不稳定性在太阳风的演化过程中扮演了极为重要的角色.详细介绍了太阳风中常见的电子动力学不稳定性,并基于等离子体动力论,详细介绍太阳风传播过程中所出现的各种不稳定性,尤其是在近日球层和太阳大气区域所出现的电子声热流不稳定性以及低混杂热流不稳定性,并分析其波粒相互作用机制,以便更加深入地研究太阳风传播过程中的电子分布函数演化.Electron as one component of the solar wind,can inuence the solar wind through several mechanisms.The electrons in the solar wind usually exhibit two features in the non-thermal equilibrium distribution:temperature anisotropy and electron beam.Such a non-thermal equilibrium distribution can excite electron instabilities and generate plasma waves through wave-particle interaction.The generated waves can regulate solar wind particle distribution in turn,resulting the heating of background particles in the solar wind.Thus electron kinetic instabilities play an important role in the evolution of solar wind.This manuscript will introduce the electron kinetic instabilities in the solar wind.Based on the plasma kinetic theory,we will discuss the instabilities which emerge during the solar wind propagating process,especially the electron acoustic heat ux instability and lower hybrid heat ux instability in the solar atmosphere and the inner heliosphere.In addition,we analyze wave-particle interaction mechanism of these instabilities,in order to make a profound study of the evolution of the electron distribution function in the solar wind propagating process.

关 键 词：太阳风 磁场 等离子体不稳定性 哨声波 

分 类 号：P142[天文地球—天体物理]