Propagation of Small Disturbances in a Viscous Compressible Fluid of Finite Electrical Conductivity

Let us consider a mass of fluid of density ρ₀ and pressure p0 in which prevails a uniform magnetic field H^→₀. We assume that the fluid is isotropic so that the kinematic viscosity v, permeability μ, electrical conductivity σ are scalar quantities taken to be constant in time and space and independent of temperature, electric and magnetic fields, etc.