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COMMENTS ON ?VISCOUS DAMPING OF NON-ADIABATIC MHD  

Vinay S. Pandey   Submitted: 2006-11-08 00:06

Considering thermal conduction, compressive viscosity and optically thin radiation as damping mechanisms for MHD waves, we derive a six-order general dispersion relation. We point out a fundamental flaw in the derivation of five-order dispersion relation by Kumar and Kumar (2006) who adopt (v_1x, v_1z, p_1)as a basis vector. The correct definition of the motion in the x-z plane (2-D vector space) stems from the two independent variables, namely (v_1x,v_1z).

Authors: B. N. DWIVEDI and V.S. PANDEY
Projects: None

Publication Status: submitted
Last Modified: 2006-11-08 08:24
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On the dispersion relation for MHD waves in homogeneous plasma  

Vinay S. Pandey   Submitted: 2006-11-08 00:01

We consider viscosity and thermal conductivity as dissipation mechanisms to derive a general dispersion relation for MHD waves propagating in a homogeneous plasma. We show that the actual dispersion relation for MHD waves in a homogeneous medium must be six-order. The finding is in agreement (except some coefficients) with the results of Porter et al. (1994) but it is in disagreement with the previous results obtained by Kumar et al. (2006). We also discuss in detail differences between our approach and those considered by other authors.

Authors: B. N. Dwivedi and V.S. Pandey
Projects: None

Publication Status: submitted
Last Modified: 2006-11-08 08:24
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COMMENTS ON ?VISCOUS DAMPING OF NON-ADIABATIC MHD
On the dispersion relation for MHD waves in homogeneous plasma

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