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Dispersion relations and polarizations of low-frequency waves in two-fluid plasmas
Zhao, Jinsong
Source PublicationPHYSICS OF PLASMAS
AbstractAnalytical 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.
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas
WOS IDWOS:000353837200021
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Document Type期刊论文
AffiliationChinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
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.
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