Speaker
Alemayehu Cherkos
(Addis Ababa University)
Description
We determine the general dispersion relation for the propagation of
magnetohydrodynamic (MHD) waves in astrophysical plasma by considering the effect of
gravitational instability and viscosity with anisotropic pressure tensor and
heat-conducting plasma. Basic MHD equations have been derived and linearized by the
method of perturbation to develop the general form of dispersion relation equation.
Our result indicates that the transverse propagation of waves in such a plasma is
affected by the inclusion of heat conduction. For wave propagation, parallel to the
magnetic field direction, we find that the fairhose mode is unaffected, whereas the
mode corresponding to the gravitational instability is modified in astrophysical
plasma with anisotropic pressure tensor being stable in the presence of viscosity and
strong magnetic field at considerable wavelength.
Primary author
Alemayehu Cherkos
(Addis Ababa University)
