Propagation of Acoustic Waves in Coronal Plasma

Abstract

The influence of the effects of thermal conduction and heating/radiative losses on the propagation of acoustic waves in a rarefied high-temperature plasma is studied. A constant heating function is chosen, and an interpolation is used for the radiative-loss function, which is based on the values found by the CHIANTI 10 code. Waves are analyzed in a linear approximation based on the dispersion relation. The input parameters in the problem are the plasma temperature and density and the output parameters are the period of oscillations and their damping time. Conversely, having observational data on compression waves, one can pose the problem of finding the parameters of the coronal plasma from the oscillation parameters. The situations in which the effect of the misbalance between heating and losses can, along with thermal conductivity, play a significant role in wave damping are shown. The temperature ranges at which instability and aperiodic damping of acoustic oscillations are possible are determined.