Propagating torsional Alfven waves in thermally active solar plasma

The aim of this study is to shed light on the effects connected with thermal misbalance due to non-equal cooling and heating rates induced by density and temperature perturbations in solar active regions hosting either propagating torsional or shear Alfven waves. A description for the non-linear forces connected with Alfven waves in non-ideal conditions is provided, based on the second-order thin flux tube approximation. This provides insight into the effects of Alfven-induced motions on the boundary of thin magnetic structures in thermally active plasmas. The equations describing the process of generating longitudinal velocity perturbations, together with density perturbations by non-linear torsional Alfven waves, are obtained and solved analytically. It is shown that the phase shift (compared with the ideal case) and the amplitude of the induced longitudinal plasma motions against the period of the mother Alfven wave are greater for shear Alfven waves compared with torsional Alfven waves, although following the same pattern. The difference in the influence of thermal misbalance on the induced velocity perturbations is governed by the plasma-beta although its effect is stronger for shear waves. It is deduced that for a harmonic Alfven driver the induced density perturbations are left uninfluenced by the thermal misbalance.