Scattering of acoustic waves from a magnetic flux tube embedded in a radiating fluid

Abstract

The effect of the radiation field in mediating the interaction between the solar acoustic oscillations and isolated magnetic flux tubes is studied using a refinement of the basic seismology paradigm introduced by Wilson (1980) and studied by Abdelatif and Thomas (1987). The calculation of the mode conversion of acoustic to radiation-diffusion modes by a uniformly magnetized flux tube is described in detail. An embedding procedure is introduced that allows the magnetic flux tube to be completely specified by essentially two parameters, the radius and magnetic field strength, once the external atmosphere is described. The use of the projection of the wave vector onto the axis of the magnetic flux tube to describe the incident acoustic plane wave is discussed. Radiative effects are found to be almost inconsequential over most of the parameter space appropriate for the interaction p-modes with magnetic flux concentrations near the solar surface. 20 refs.