On the propagation of compressive waves in a radiating magnetized fluid

Abstract

Using the Mihalas and Mihalas (1983) treatment of the radiation field, the dispersion relation for linear compressive plane waves in a homogeneous, unstratified, uniformly magnetized, radiating fluid has been obtained. In the opticallly thick limit, the present relation is shown to predict two weakly damped anisotropic radiation-modified magnetoacoustic modes and a strongly damped radiation-diffusion mode. The theory has been applied to the example of the interaction of the solar acoustic oscillations with discrete photospheric magnetic structures such as sunspots, pores, and knots.