The effect of a magnetic field on the stability of convective fluid motion where viscosity depends on temperature

In this present paper the authors study the question dealing with the effect of a magnetic field and the nonuniformity in the relationship between viscosity and temperature on the spectrum of normal perturbations, which makes it possible to describe the most ″dangerous″ perturbations leading to disruption of stability in convective motion, as well as to track their development. It was noted that the influence exerted by the magnetic field on the phase velocities of propagation for the perturbations that the longitudinal field does not change their magnitude.