Alfvén resonance on Kelvin-Helmholtz vortices at the Earth’s magnetopause

IF 1.8 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astrophysics and Space Science Pub Date : 2024-04-02 DOI:10.1007/s10509-024-04294-7

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Abstract

The Alfvén resonance is an extensively observed phenomenon in astrophysics, playing a crucial role in understanding energy transfer, macroscopic structure, and evolutionary processes within celestial environments such as the magnetospheres of stars, planets, and other astrophysical objects. In this work, we investigate the spatial and temporal distribution of the Alfvén resonance points during the evolution of Kelvin-Helmholtz instability (KHI) at Earth’s dusk-flank magnetopause in numerical MHD simulation. The results show that, there is no appearance of the Alfvén resonance points $P_{AR}$ during the linear phase. In the early nonlinear phase, the Alfvén resonance points $P_{AR}$ , whose duration time is approximately $\Delta {t_{1}} \sim 3{t_{A}}$ , looks like the “eyelid” of the KH vortex. During the nonlinear growth phase, the Alfvén resonance points $P_{AR}$ , whose duration time is about $\Delta {t_{2}} \sim 6{t_{A}}$ , appear at both the “eyelid” and the outer “corner” of the KH vortex. The Alfvén resonance phenomenon disappears with the decay of KH vortex.

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地球磁层顶开尔文-赫尔姆霍兹涡旋的阿尔芬共振

摘要 Alfvén共振是天体物理学中一种被广泛观测到的现象，对于理解恒星、行星和其他天体的磁层等天体环境中的能量传递、宏观结构和演化过程起着至关重要的作用。在这项工作中，我们通过 MHD 数值模拟研究了地球黄昏侧磁层顶开尔文-赫尔姆霍兹不稳定性（KHI）演化过程中阿尔弗文共振点的时空分布。结果表明，在线性阶段没有出现阿尔芬共振点 $P_{AR}$。在早期非线性阶段，阿尔弗共振点（P_{AR}）的持续时间约为（\Delta {t_{1}} \sim 3{t_{A}}\ ），看起来像 KH 涡旋的 "眼睑"。在非线性增长阶段，Alfvén 共振点 $P_{AR}$ 的持续时间约为$\Delta {t_{2}} \sim 6{t_{A}}$ ，同时出现在 KH 涡旋的 "眼睑 "和外 "角 "处。阿尔芬共振现象随着 KH 涡旋的衰减而消失。

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来源期刊

Astrophysics and Space Science 地学天文-天文与天体物理

CiteScore

3.40

自引率

5.30%

发文量

106

审稿时长

2-4 weeks

期刊介绍： Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.

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