Dispersion relations and polarizations of low-frequency waves in two-fluid plasmas

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	Dispersion relations and polarizations of low-frequency waves in two-fluid plasmas
	Zhao, Jinsong
刊名	PHYSICS OF PLASMAS
	2015-04-01
卷号	22 期号:4 页码:42115
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.
学科主题	天文和天体物理
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
语种	英语
WOS记录号	WOS:000353837200021
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/14838]
专题	紫金山天文台_太阳和太阳系等离子体研究团组
作者单位	Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Jinsong. Dispersion relations and polarizations of low-frequency waves in two-fluid plasmas[J]. PHYSICS OF PLASMAS,2015,22(4):42115.
APA	Zhao, Jinsong.(2015).Dispersion relations and polarizations of low-frequency waves in two-fluid plasmas.PHYSICS OF PLASMAS,22(4),42115.
MLA	Zhao, Jinsong."Dispersion relations and polarizations of low-frequency waves in two-fluid plasmas".PHYSICS OF PLASMAS 22.4(2015):42115.