Obliquely nonlinear solitary waves in magnetized electron–positron–ion plasma

IF 1.6 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
L. Nazziwa, I. Habumugisha, E. Jurua
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引用次数: 0

Abstract

This study focused on nonlinear ion-acoustic solitary structures (IASS) in a magnetized plasma system that is kappa distributed comprising electrons, positrons, and ions (e–p–i) using a fluid theory approach. A novel nonlinear inverse dispersion relation peculiar to this complex plasma environment was derived. The dispersive properties of ion-acoustic waves in magnetized e–p–i plasma environment were investigated considering the influence of various superthermal of electrons and positrons \((\kappa _{e}~\textrm{and} ~\kappa _{p})\), unperturbed positron to ion density ratio, p, electron to ion density ratio, \((\delta )\), ion to electron temperature ratio, \((\sigma )\). By numerically analyzing the impact of plasma properties, particularly the nonlinear dispersion characteristics in a magnetized e–p–i plasma. The influence of the external magnetic field (obliqueness) angle, \(\theta\), which alters the frequency value of \((\omega ^{2})\). It was found that the values of \(\delta\), the frequency \(\omega ^{2}\) of IASS waves decreases with increasing \(\delta\). This result has significant implications for understanding the dynamics of various astrophysical settings, such as the solar wind. However, when \(\delta > 0\), the curves become more nonlinear, indicating the waves become more dispersive. Further, it is discovered that as the value of \(\theta\) for \(+~\omega ^{2}\) solution increases, the shape of the dispersion curve does not significantly change. In contrast, it is observed from the \(-~\omega ^{2}\) solution that for all values of angle \(\theta\), frequency decreases with increasing angle \(\theta\). This is because the ion-acoustic mode is strong at the propagation angle at \(\theta = 0^{\circ }\) and weakens as the propagation angle increases, eventually disappearing at \(\theta = 90^{\circ }\). Thus, these findings provide an appreciable understanding of the dispersion characteristics of obliquely propagating IASS modes in a magnetized e–p–i plasma. In conclusion, our results provide important and new information on the interaction of plasma parameters in complex astronomical (natural) and laboratory (artificial) settings.

Abstract Image

磁化电子-正电子-离子等离子体中的斜非线性孤波
本研究采用流体理论方法,重点研究了由电子、正电子和离子(e-p-i)组成的卡帕分布磁化等离子体系统中的非线性离子声孤结构(IASS)。推导出了这种复杂等离子体环境特有的新型非线性反色散关系。考虑到电子和正电子的各种超热((\kappa _{e}~\textrm{and} ~\kappa _{p})\), 未受扰动的正电子与离子密度比,p, 电子与离子密度比,\((\delta )\),离子与电子温度比,\((\sigma )\)的影响,研究了磁化e-p-i等离子体环境中离子声波的色散特性。通过数值分析等离子体特性的影响,特别是磁化 e-p-i 等离子体中的非线性色散特性。外磁场(斜度)角\(\theta\)的影响改变了频率值\((\omega ^{2})\)。研究发现,随着 \(\delta\) 的增大,IASS 波的频率 \(\omega ^{2}\)会减小。这一结果对于理解太阳风等各种天体物理环境的动力学具有重要意义。然而,当\(\delta > 0\) 时,曲线变得更加非线性,表明波变得更加分散。此外,我们还发现,随着\(+~\omega ^{2}\)解的\(\theta\)值的增加,色散曲线的形状并没有明显变化。相反,从(-~\omega ^{2}\)溶液中可以观察到,在所有角度(\theta\)值下,频率都会随着角度(\theta\)的增大而降低。这是因为离子声学模式在传播角为(theta = 0^{\circ }\ )时很强,随着传播角的增大而减弱,最终在(theta = 90^{\circ }\ )时消失。因此,这些发现提供了对磁化 e-p-i 等离子体中斜向传播的 IASS 模式的弥散特性的理解。总之,我们的研究结果为复杂的天文(自然)和实验室(人工)环境中等离子体参数的相互作用提供了重要的新信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Indian Journal of Physics
Indian Journal of Physics 物理-物理:综合
CiteScore
3.40
自引率
10.00%
发文量
275
审稿时长
3-8 weeks
期刊介绍: Indian Journal of Physics is a monthly research journal in English published by the Indian Association for the Cultivation of Sciences in collaboration with the Indian Physical Society. The journal publishes refereed papers covering current research in Physics in the following category: Astrophysics, Atmospheric and Space physics; Atomic & Molecular Physics; Biophysics; Condensed Matter & Materials Physics; General & Interdisciplinary Physics; Nonlinear dynamics & Complex Systems; Nuclear Physics; Optics and Spectroscopy; Particle Physics; Plasma Physics; Relativity & Cosmology; Statistical Physics.
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