Properties of low and medium frequency modes in two-fluid plasma

Based on a two-fluid plasma model where the electron mass and the displacement current are neglected, the eigenmode properties such as the frequency and the compressibility are studied. It is found that these properties strongly depend on the two-fluid parameter k ℓ i , where k is the wave number of...

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Bibliographic Details
Published in:Physics of plasmas 2005-05, Vol.12 (5), p.052113-052113-9
Main Authors: Ishida, Akio, Cheng, C. Z., Peng, Y-K. M.
Format: Article
Language:English
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Summary:Based on a two-fluid plasma model where the electron mass and the displacement current are neglected, the eigenmode properties such as the frequency and the compressibility are studied. It is found that these properties strongly depend on the two-fluid parameter k ℓ i , where k is the wave number of a mode and ℓ i is the ion skin depth. Especially it is found that as the two-fluid parameter k ℓ i increases beyond unity, the Alfvén wave, which is an incompressible mode in the magnetohydrodynamics (MHD) limit, becomes compressible and its phase velocity approaches to the acoustic speed. The slow magnetosonic wave, which is compressible in the MHD limit, becomes incompressible as k ℓ i increases. Implications of these results are also discussed.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.1905604