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Effects of ion temperature and inertia on kinetic Alfven waves
Wu, DJ
AbstractKinetic Alfven wave (KAW) has been an interesting topic for discussion extensively in the fields of laboratory, space, and astrophysical plasmas. A general dispersion equation is derived from the exact two-fluid model in this paper. Based on this dispersion equation, dispersion of Alfven waves near the Alfven frequency omega(A) = v(A)k(parallel to) are discussed for arbitrary values of wavelength, where v(A) is the Alfven velocity, and k(parallel to) = 2pi/lambda(parallel to) is the wavenumber parallel to the ambient magnetic field. For the short wavelength cases of klambda(i), >>1, where lambda(i) = v(A)/omega(ci) and omega(ci) are the ion inertial length and gyrofrequency,, respectively, our dispersion relations are appropriate for discussing effects of the ion temperature and inertia on KAWs. The present results show that both the ion temperature and inertia can affect considerably the behaviors of KAWs in propagation, resonance, and polarization, In particular, our results may be a great help to understanding some salient features of the low-frequency (in comparison with the ion gyrofrequency omega(ci)) electromagnetic fluctuations frequently observed by the FREJA and FAST satellites in the auroral zone of the Earth's ionosphere and magnetosphere.
KeywordPlasma Alfven Wave Dispersion Relation
Subject AreaPhysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000182441900016
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Wu, DJ. Effects of ion temperature and inertia on kinetic Alfven waves[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2003,39(4):457-464.
APA Wu, DJ.(2003).Effects of ion temperature and inertia on kinetic Alfven waves.COMMUNICATIONS IN THEORETICAL PHYSICS,39(4),457-464.
MLA Wu, DJ."Effects of ion temperature and inertia on kinetic Alfven waves".COMMUNICATIONS IN THEORETICAL PHYSICS 39.4(2003):457-464.
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