  In this investigation, we explore the thermal effects on a suspension
containing isotropic scattering phototactic microorganisms. The setup involves
illuminating the suspension with collimated irradiation from the top, coupled
with heating or cooling applied from the bottom. The governing equations
encompass the Navier-Stokes equations with the Boussinesq approximation, the
diffusion equation for motile microorganisms, and the energy equation for
temperature. Using linear perturbation theory, we conduct a comprehensive
analysis of the suspension's linear stability. The findings of this
investigation reveal that the suspension experiences increased stability as a
consequence of scattering.
