Oblique Quasi-kink Modes in Solar Coronal Slabs Embedded in an Asymmetric Magnetic Environment: Resonant Damping, Phase and Group Diagrams

Oblique Quasi-kink Modes in Solar Coronal Slabs Embedded in an Asymmetric Magnetic Environment: Resonant Damping, Phase and Group Diagrams
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嵌入不对称磁环境中的太阳日冕板的斜准扭结模式:谐振阻尼、相位图和群图

DOI:
10.3847/1538-4357/ac9d35
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发表时间:
2022-10
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Hui Yu
Hui Yu
中科院分区:
其他
文献类型:
--
作者:
Shao-Xia Chen;Bo Li;Mingzhe Guo;Mijie Shi;Hui Yu

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抽象的。人们对静态、直线、场对齐、一维平衡中的磁声波非常感兴趣,其中磁板的外部在两侧不同。我们专注于无压设置中的俘获、横向基本、倾斜准扭结模式,其中密度从均匀内部(密度为 ρ.i)到两侧均匀外部(密度为 ρ.L 或 ρ.R)连续变化,假设 ρ.L 或 ρ.R 为 ρ.R。 L≤ρ。 R≤ρ。我。相对于相关研究,连续结构和倾斜传播使我们的研究具有新颖性,并通过阿尔文共振导致波阻尼。我们将谐振阻尼准扭结模式计算为电阻本征模式,并通过改变 ρ 来隔离系统不对称的影响。我/ρ。 R 从“完全对称”(ρ.i/ρ.R = ρ.i/ρ.L) 到“完全不对称”极限 (ρ.i/ρ.R = 1)。我们发现阻尼率具有非单调 ρ。我/ρ。 R 依赖性是由于两个阿尔文连续体之间的差异而导致的,而共振吸收仅在一个连续体中发生 ρ 时。我/ρ。 R 低于某个阈值。我们还发现系统不对称导致相图和群图产生两种性质不同的状态。当配置离“完全不对称”(“完全对称”)配置不远时,相轨迹和群轨迹基本上位于相对于平衡磁场的同一侧(不同侧)。我们的数值结果通过在薄边界极限方面取得的分析进展来理解,并讨论了轴向固定模式和脉冲激发波列的成像观测。
Abstract. There has been considerable interest in magnetoacoustic waves in static, straight, field-aligned, 1D equilibria where the exteriors of a magnetic slab are different between the two sides. We focus on trapped, transverse fundamental, oblique quasi-kink modes in pressureless setups, where the density varies continuously from a uniform interior (with density ρ. i) to a uniform exterior on either side (with density ρ. L or ρ. R), assuming ρ. L ≤ ρ. R ≤ ρ. i. The continuous structuring and oblique propagation make our study new, relative to pertinent studies, and lead to wave damping via the Alfvén resonance. We compute resonantly damped quasi-kink modes as resistive eigenmodes, and isolate the effects of system asymmetry by varying ρ. i/ρ. R from the “Fully Symmetric” (ρ. i/ρ. R = ρ. i/ρ. L) to the “Fully Asymmetric” limit (ρ. i/ρ. R = 1). We find that the damping rates possess a nonmonotonic ρ. i/ρ. R-dependence as a result of the difference between the two Alfvén continua, and resonant absorption occurs only in one continuum when ρ. i/ρ. R is below some threshold. We also find that the system asymmetry results in two qualitatively different regimes for the phase and group diagrams. The phase and group trajectories lie essentially on the same side (different sides) relative to the equilibrium magnetic field when the configuration is not far from a “Fully Asymmetric” (“Fully Symmetric”) one. Our numerical results are understood by making analytical progress in the thin-boundary limit, and discussed for imaging observations of axial standing modes and impulsively excited wavetrains.
DOI: 10.1086/593203
发表时间: 2008-09
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