波阻尼和有限垂直尺度对低贝塔等离子体中三维阿尔芬波参数衰减的影响

IF 2 3区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Physics of Plasmas Pub Date : 2024-08-23 DOI:10.1063/5.0216871
Feiyu Li, Xiangrong Fu, Seth Dorfman
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引用次数: 0

摘要

剪切阿尔芬波参数衰减不稳定性(PDI)为实现显著的波耗散和等离子体加热提供了潜在的途径。然而,关于 PDI 如何在现实的三维(3D)开放系统中激发,以及实验室和太空等离子体中发现的有限垂直波尺度如何影响激发等基本问题,人们仍然知之甚少。在此,我们首次对低贝塔等离子体中的动力学阿尔芬波 PDI 进行了三维、开放边界、动力学-流体混合模拟。主要发现是,PDI 激发受到存在的波阻尼的强烈限制,包括电子-离子碰撞阻尼(以恒定电阻率表示)和与有限尺度阿尔费文波相关的几何衰减,以及子声波的离子朗道阻尼。然而,垂直波尺度本身并没有起到明显的作用:只要平行深思动力的大小保持不变,不同垂直尺度的波都会表现出类似的不稳定性激发。这些发现得到了理论分析和估算的证实。对三维动力学阿尔芬波 PDI 物理的这一新认识对于实验室研究基本等离子体过程至关重要,也有助于未来评估 PDI 在低贝塔空间等离子体中的相关性/作用。
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Effects of wave damping and finite perpendicular scale on three-dimensional Alfvén wave parametric decay in low-beta plasmas
Shear Alfvén wave parametric decay instability (PDI) provides a potential path toward significant wave dissipation and plasma heating. However, fundamental questions regarding how PDI is excited in a realistic three-dimensional (3D) open system and how the finite perpendicular wave scale—as found in both laboratory and space plasmas—affects the excitation remain poorly understood. Here, we present the first 3D, open-boundary, hybrid kinetic-fluid simulations of kinetic Alfvén wave PDI in low-beta plasmas. Key findings are that the PDI excitation is strongly limited by the wave damping present, including electron–ion collisional damping (represented by a constant resistivity) and geometrical attenuation associated with the finite-scale Alfvén wave, and ion Landau damping of the child acoustic wave. The perpendicular wave scale alone, however, plays no discernible role: waves of different perpendicular scales exhibit similar instability excitation as long as the magnitude of the parallel ponderomotive force remains unchanged. These findings are corroborated by theoretical analysis and estimates. This new understanding of 3D kinetic Alfvén wave PDI physics is essential for laboratory study of the basic plasma process and may also aid future evaluation of the relevance/role of PDI in low-beta space plasma.
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来源期刊
Physics of Plasmas
Physics of Plasmas 物理-物理:流体与等离子体
CiteScore
4.10
自引率
22.70%
发文量
653
审稿时长
2.5 months
期刊介绍: Physics of Plasmas (PoP), published by AIP Publishing in cooperation with the APS Division of Plasma Physics, is committed to the publication of original research in all areas of experimental and theoretical plasma physics. PoP publishes comprehensive and in-depth review manuscripts covering important areas of study and Special Topics highlighting new and cutting-edge developments in plasma physics. Every year a special issue publishes the invited and review papers from the most recent meeting of the APS Division of Plasma Physics. PoP covers a broad range of important research in this dynamic field, including: -Basic plasma phenomena, waves, instabilities -Nonlinear phenomena, turbulence, transport -Magnetically confined plasmas, heating, confinement -Inertially confined plasmas, high-energy density plasma science, warm dense matter -Ionospheric, solar-system, and astrophysical plasmas -Lasers, particle beams, accelerators, radiation generation -Radiation emission, absorption, and transport -Low-temperature plasmas, plasma applications, plasma sources, sheaths -Dusty plasmas
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