天体物理等离子体中的动力学阿尔芬孤波

IF 1.4 4区 物理与天体物理 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
AIP Advances Pub Date : 2024-09-17 DOI:10.1063/5.0226568
M. M. Hasan, M. R. Hossen, A. A. Mamun
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引用次数: 0

摘要

磁层等离子体(热而稀薄)和太阳风等离子体(冷而稠密)被地球磁极分隔开来,两种等离子体在磁极共存。这种等离子体混合会产生不同类型的等离子体扩散,动能阿尔芬孤波(KASWs)就是其中之一。在这项工作中,采用理论方法研究了磁化等离子体系统中重离子声学孤波(HIAKASWs)的基本特性,该系统的组成成分是非广延q分布的双温电子和动力学重离子。利用还原扰动技术研究了磁化无碰撞等离子体系统的扰动,推导出了 Korteweg-de Vries(K-DV)和修正 K-DV (MK-DV)方程,从而确定了小振幅但有限振幅 HIAKASW 的基本特征。据观察,非广延性电子的存在、磁场、斜角(外部磁场与波传播之间的夹角)、等离子体粒子数密度以及各种等离子体的温度都会显著改变 HIAKASW 的基本特性。本研究的发现可能有助于理解各种星际等离子体环境中的非线性波特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Kinetic Alfvén solitary waves in astrophysical plasmas
The magnetospheric plasma (hot and thin) and the solar wind plasma (cold and dense) are separated by the Earth’s magnetopause, in which plasmas of both origins coexist. Different types of plasma diffusions are found due to this plasma mixing, and kinetic Alfvén solitary waves (KASWs) are one of them. In this work, a theoretical approach is taken to study the fundamental properties of heavy ion acoustic KASWs (HIAKASWs) in a magnetized plasma system whose constituents are nonextensive q-distributed two temperature electrons with dynamical heavy ions. The perturbations of the magnetized collisionless plasma system are investigated using the reductive perturbation technique to deduce the Korteweg–de Vries (K–DV) and modified K–DV (MK–DV) equations to determine the fundamental characteristics of small, but finite amplitude HIAKASWs. The presence of nonextensive electrons, magnetic field, obliquity angle (the angle between the external magnetic field and wave propagation), plasma particle number densities, and the temperature of various plasma species are observed to significantly alter the fundamental properties of HIAKASWs. The findings of our present study may be useful for comprehending the nonlinear wave properties in diverse interstellar plasma environments.
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来源期刊
AIP Advances
AIP Advances NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
2.80
自引率
6.20%
发文量
1233
审稿时长
2-4 weeks
期刊介绍: AIP Advances is an open access journal publishing in all areas of physical sciences—applied, theoretical, and experimental. All published articles are freely available to read, download, and share. The journal prides itself on the belief that all good science is important and relevant. Our inclusive scope and publication standards make it an essential outlet for scientists in the physical sciences. AIP Advances is a community-based journal, with a fast production cycle. The quick publication process and open-access model allows us to quickly distribute new scientific concepts. Our Editors, assisted by peer review, determine whether a manuscript is technically correct and original. After publication, the readership evaluates whether a manuscript is timely, relevant, or significant.
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