Characteristics of magnetohydrodynamic waves in Harris-type current sheet with guide magnetic field By

K. W. Lee, L. N. Hau

研究成果: 雜誌貢獻期刊論文同行評審

9 引文 斯高帕斯(Scopus)

摘要

An overview is presented of the characteristics of hydromagnetic waves propagating in Harris-type current sheet with magnetic field of Bx(z) × ̌ and an embedded guide By component based on the ideal magnetohydrodynamic (MHD) model. The wave equations are expressed in the (k, k, z) coordinates, and singularities are identified for general cases of ky≠0 and By ≠ 0, where k and k are the components of the wave vector parallel and perpendicular to the local magnetic field, respectively, and the inhomogeneity is in the z direction. The presence of By may lead to the rotation of the magnetic field relative to the wave vector so that a singular layer with k = 0 surrounded by a neighboring region of k ≠ 0 may exist. This result is in contrast with the Case of By = 0 for which Alfvén or field-line resonance associated with the mathematical singularity tends to occur for k ≠= 0 and ω = k CA, where C A is the Alfvén speed. The possibility for MHD waves with frequency ofω = k CA to propagate through the inhomogeneous layer with By ≠ 0 is analyzed, and numerical solutions for discrete eigenmodes with various free parameter values are presented.

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文章編號A12209
期刊Journal of Geophysical Research: Space Physics
113
發行號12
DOIs
出版狀態已出版 - 1 12月 2008

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