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:
影响因子:
--
通讯作者:
Hui Yu
中科院分区:
文献类型:
--
作者:
Shao-Xia Chen;Bo Li;Mingzhe Guo;Mijie Shi;Hui Yu
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.
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DOI:
10.1086/593203
发表时间:
2008-09
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
J. Terradas;J. Andries;J. Andries;Marcel Goossens;I. Arregui;R. Oliver;J. Ballester
通讯作者:
J. Terradas;J. Andries;J. Andries;Marcel Goossens;I. Arregui;R. Oliver;J. Ballester
影响因子:
20.9
作者:
V. Nakariakov;E. Verwichte
通讯作者:
V. Nakariakov;E. Verwichte
影响因子:
20.9
作者:
M. Aschwanden
通讯作者:
M. Aschwanden
DOI:
10.3847/1538-4357/abd7f3
发表时间:
2020-12
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Shao-Xia Chen;Bo Li;T. Doorsselaere;M. Goossens;Hui Yu;M. Geeraerts
通讯作者:
Shao-Xia Chen;Bo Li;T. Doorsselaere;M. Goossens;Hui Yu;M. Geeraerts
DOI:
10.3847/1538-4357/aae83c
发表时间:
2018-11
期刊:
The Astrophysical Journal
影响因子:
--
作者:
D. Shukhobodskaia;R. Erdélyi
通讯作者:
D. Shukhobodskaia;R. Erdélyi