Thermal Instability of Radiative Plasma with Finite Electron Inertia and Finite Larmor Radius Corrections for Structure Formation

Abstract

An investigation is made on the effects of finite electron inertia, finite Larmor radius (FLR) corrections, and radiative heat-loss functions, on the thermal instability of an infinite homogeneous, viscous plasma incorporating the effects of finite electron resistivity and thermal conductivity, for structure formation in astrophysical plasma environment. A general dispersion relation is derived using the normal mode analysis method with the help of relevant linearized perturbation equations of the problem. The wave propagation is discussed for longitudinal and transverse directions to the external magnetic field, and the conditions of modified thermal instabilities and stabilities are discussed in different cases. The thermal instability criterion gets modified by inclusion of radiative heat-loss functions. The finite electrical resistivity removes the effect of the magnetic field, and viscosity of the medium removes the effect of FLR from the condition of radiative instability. Numerical calculation shows a stabilizing effect of heat-loss function, FLR corrections, and viscosity and a destabilizing effect of finite electrical resistivity and finite electron inertia on the thermal instability of the considered system. Results presented here are helpful for understanding the process of structure formation in the astrophysical plasma environment.