Field Localization and Density Cavitation in Low-Beta Plasmas

IF 1.1 4区物理与天体物理 Q4 PHYSICS, APPLIED

Laser and Particle Beams Pub Date : 2021-11-28 DOI:10.1155/2021/2891080

M. Rinawa, P. Chauhan, Sintu Kumar, M. K. Singh, H. Singh, Amit Sharma, R. Sharma

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Abstract

In the present paper, filamentous structure formation, associated turbulent spectrum, and density cavity formation phenomena have been investigated for low- β plasma β ≪ m e / m i applicable to the auroral region. A set of dimensionless equations governing the dynamics of three dimensionally propagating inertial Alfvén wave (3D-IAW) and perpendicularly propagating magnetosonic wave (PMSW) has been developed. Ponderomotive force due to 3D-IAW has been included in the dynamics of the PMSW. Numerical simulation has been performed to study the nonlinear coupling of these two waves. From the obtained results, we found that the field intensity localization takes place which may further lead to the additional dissipation/turbulence process for particle heating and acceleration in space plasma. The associated turbulent spectrum is obtained with scaling nearly k − 4.28 at smaller scales (in the dissipation range). Relevance of the obtained results with the observations reported by various spacecrafts such as Hawkeye and Heos 2 has been discussed. Also, density fluctuations (depletion) of ∼ 0.10 n 0 are calculated, which are consistent with the FAST spacecraft observation reported.

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低β等离子体中的场局域化和密度空化

在本文中，研究了适用于极光区域的低β等离子体的丝状结构形成、相关的湍流光谱和密度空腔形成现象。建立了三维传播惯性alfvsamn波(3D-IAW)和垂直传播磁声波(PMSW)动力学的一组无量纲方程。由于3D-IAW的有源动力已经包括在PMSW的动力学中。通过数值模拟研究了这两种波的非线性耦合。从得到的结果来看，我们发现场强局域化可能进一步导致空间等离子体中粒子加热和加速的额外耗散/湍流过程。在较小的尺度(在耗散范围内)，相关的湍流谱的标度接近k−4.28。讨论了所获得的结果与鹰眼和Heos 2等各种航天器报告的观测结果的相关性。此外，还计算了密度波动(损耗)为~ 0.10 n / 0，这与FAST航天器观测报告一致。

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来源期刊

Laser and Particle Beams PHYSICS, APPLIED-

CiteScore

1.90

自引率

11.10%

发文量

审稿时长

1 months

期刊介绍： Laser and Particle Beams is an international journal which deals with basic physics issues of intense laser and particle beams, and the interaction of these beams with matter. Research on pulse power technology associated with beam generation is also of strong interest. Subjects covered include the physics of high energy densities; non-LTE phenomena; hot dense matter and related atomic, plasma and hydrodynamic physics and astrophysics; intense sources of coherent radiation; high current particle accelerators; beam-wave interaction; and pulsed power technology.