不对称波导中的磁流体动力波及其在太阳物理学中的应用--综述

Symmetry Pub Date : 2024-09-18 DOI:10.3390/sym16091228
Robertus Erdélyi, Noémi Kinga Zsámberger
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引用次数: 0

摘要

太阳大气是一个复杂、耦合、高度动态的等离子体环境,由于引力场和磁场的存在而呈现出丰富的结构。太阳大气的一些特征可以作为磁流体动力(MHD)波的引导介质。同时,这些波导可能包含不同程度的流,从而破坏波导本身的稳定性。由于空间和地面观测站的空间、时间和光谱分辨率不断提高,人们发现 MHD 波在太阳大气中无处不在。这些探测结果与最近的理论进展相结合,通过应用强大的太阳磁震学(SMS)概念,获得了有关太阳等离子体和渗透其中的磁场的诊断信息。在所使用的 MHD 波导模型中加入不对称剪切流可能会大大影响所获得的地震学结果。此外,它们还会影响开尔文-赫尔姆霍兹不稳定性的起始阈值,在相对流速足够高的情况下,这种不稳定性会导致能量耗散,造成太阳大气加热--这是太阳物理学中一个长期存在且研究最深入的问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Magnetohydrodynamic Waves in Asymmetric Waveguides and Their Applications in Solar Physics—A Review
The solar atmosphere is a complex, coupled, highly dynamic plasma environment, which shows rich structuring due to the presence of gravitational and magnetic fields. Several features of the Sun’s atmosphere can serve as guiding media for magnetohydrodynamic (MHD) waves. At the same time, these waveguides may contain flows of various magnitudes, which can then destabilise the waveguides themselves. MHD waves were found to be ubiquitously present in the solar atmosphere, thanks to the continuous improvement in the spatial, temporal, and spectral resolution of both space-born and ground-based observatories. These detections, coupled with recent theoretical advancements, have been used to obtain diagnostic information about the solar plasma and the magnetic fields that permeate it, by applying the powerful concept of solar magneto-seismology (SMS). The inclusion of asymmetric shear flows in the MHD waveguide models used may considerably affect the seismological results obtained. Further, they also influence the threshold for the onset of the Kelvin–Helmholtz instability, which, at high enough relative flow speeds, can lead to energy dissipation and contribute to the heating of the solar atmosphere—one of the long-standing and most intensely studied questions in solar physics.
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