多组分离子镜像与回旋不稳定性研究进展
doi: 10.11728/cjss2026.05.2025-0176 cstr: 32142.14.cjss.2025-0176
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马玉端 女, 1977年8月出生于河南省周口市, 北京航空航天大学空间与地球科学学院副教授, 主要研究方向为地球磁尾离子高速流、磁暴和亚暴. E-mail: ydma@buaa.edu.cn
作者简介:
Progress in Research on Mirror and Electromagnetic Cyclotron Instabilities of Multi-component Ions
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摘要: 由离子垂直温度各向异性驱动的镜像(mirror)不稳定性和电磁离子回旋(EMIC)不稳定性在空间等离子体中普遍存在, 且在亚暴、磁暴的演化过程中具有非常重要的作用. 本文概述了磁流体力学和动理论下两种不稳定性物理机制, 回顾了单一离子成分(质子)条件下两种不稳定性的基础理论研究成果; 进一步梳理了多组分离子中两种不稳定性的研究进展, 重点探讨了地球磁层中重离子(He+, O+)的引入对两种不稳定性产生的影响; 总结了多组分等离子体中不稳定性阈值与增长率的理论推导及数值模拟成果, 分析了当前研究中存在的挑战, 并对未来理论研究、数值模拟和卫星观测提出展望, 以期全面揭示多离子组分中该两种不稳定性的调控作用及其在全局动理学中的意义.
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关键词:
- 多组分离子 /
- 温度各向异性 /
- 镜像不稳定性 /
- 电磁离子回旋不稳定性 /
- 增长率
Abstract: The mirror instability and Electromagnetic Ion Cyclotron (EMIC) instability, driven by ion perpendicular temperature anisotropy, are ubiquitous in space plasmas and play important roles in the evolution of substorms and storms. This paper outlines the physical mechanisms of these two instabilities based on Magnetohydrodynamics (MHD) and kinetic theory, and reviews the fundamental theoretical research results on the two instabilities under the condition of a single ion component (proton). EMIC waves are propagating waves below the proton cyclotron frequency along field-line resonances. In an electron- proton plasma, the waves are left-hand circularly polarized, or more generally left-hand elliptically polarized for propagation at an angle to the background field. In a multi-ion plasma, such as the magnetosphere, there are stop bands where no left-hand polarized waves are possible and bands where the waves are right-hand or right-hand elliptically polarized. Mirror modes are magnetic and plasma pressure fluctuations that are driven by proton temperature anisotropy instabilities. The wave magnetic pressure and plasma pressure are 180° out of phase with each other so there is a total pressure balance across the train of structures. Progress on the two types of instabilities in multi-component ions was further reviewed with a focus on exploring the impact of the heavy ions (He+,O+) in the terrestrial magnetosphere on these two types of instability. The theoretical derivation and numerical simulation related to instability thresholds and growth rates in multi-ion plasmas were summarized, and challenges in current research were analyzed including but not limited to non-Maxwellian ion distributions and nonlinear evolution of instability. To comprehensively reveal the regulatory effects of multi-ion components on these two types of instability and their significance in global kinetics, future research requires a combination of more systematic theories, advanced numerical simulations, and more satellite observations, which will provide important basis for a deeper understanding of energy transport and wave particle interactions in space plasma. -
图 3 在$ {n}_{{{\text{H}}^{+}}}=0.9 $, $ {n}_{{{\text{He}}^{+}}}=0.9 $, $ {n}_{{{\text{o}}^{+}}}=0.9 $和$ {T}_{\bot }/{T}_{\parallel }=8 $时不同$ {\kappa }_{\text{p}} $指数下增长率与波矢$ {K}_{\parallel } $的变化[51]
Figure 3. Variation of growth rate versus wave vector $ {K}_{\parallel } $ for different values of distribution indices $ {\kappa }_{\text{p}} $, at particle density $ {n}_{{{\text{H}}^{+}}}=0.9 $, $ {n}_{{{\text{He}}^{+}}}=0.9 $, $ {n}_{{{\text{o}}^{+}}}=0.9 $ and $ {T}_{\bot }/{T}_{\parallel }=8 $[51]
图 4 (a)磁场强度(黑线)和离子$ \beta $值(红线); (b)热压(品红线), 磁压(红线)和总压(蓝线); (c)离子温度各向异性; (d)镜像不稳定性阈值$ R $[57]
Figure 4. (a) Magnetic field strength (black) and ion plasma β (red), (b) thermal pressure (magenta), magnetic pressure (red), and their summation (blue), (c) temperature anisotropy of ions, (d) threshold of mirror mode instability[57]
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