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题名: Dispersion relations and polarizations of low-frequency waves in two-fluid plasmas
作者: Zhao JinSong(赵金松)
刊名: PHYSICS OF PLASMAS
出版日期: 2015-04-01
卷号: 22, 期号:4, 页码:42115
学科分类: 天文和天体物理
DOI: 10.1063/1.4919257
文章类型: Article
英文摘要: Analytical expressions for the dispersion relations and polarizations of low-frequency waves in magnetized plasmas based on two-fluid model are obtained. The properties of waves propagating at different angles (to the ambient magnetic field B-0) and beta (the ratio of the plasma to magnetic pressures) values are investigated. It is shown that two linearly polarized waves-namely, the fast and Alfven modes in the low-beta (beta << 1) plasmas, the fast and slow modes in the beta similar to 1 plasmas, and the Alfven and slow modes in the high-beta (beta << 1) plasmas-become circularly polarized at the near-parallel (to B-0) propagation. The negative magnetic-helicity of the Alfven mode occurs only at small or moderate angles in the low-beta plasmas, and the ion cross-helicity of the slow mode is nearly the same as that of the Alfven mode in the high-beta plasmas. It is also shown that the electric polarization delta E-z/delta E-y decreases with the temperature ratio T-e/T-i for the long-wavelength waves, and the transition between left-and right-hand polarizations of the Alfven mode in T-e/T-i not equal 0 plasmas can disappear when T-e/T-i = 0. The approximate dispersion relations in the near-perpendicular propagation, low-beta, and high-beta limits can quite accurately describe the three modes. (C) 2015 AIP Publishing LLC.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Physics, Fluids & Plasmas
研究领域[WOS]: Physics
关键词[WOS]: KINETIC ALFVEN WAVES
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000353837200021
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14838
Appears in Collections:太阳和太阳系等离子体研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
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