Investigation of the dynamics of magnetoacoustic waves in magnetic tubes of the solar corona in the presence of heating depending on the magnetic field

In this study, we studied the dispersion properties of slow magnetoacoustic (MA) waves propagating in a thermally active plasma. For plasma parameters corresponding to a “warm” coronal loop, the phase velocity of slow MA waves was calculated in the thin flow tube approximation as a function of the wave period for various scenarios of coronal heating. A heating scenario based on observations of decaying slow MA waves in long-lived coronal structures is considered. The presence of a magnetic field in the heating scenario led to the dependence of the modified tube velocity, the new long-wavelength limit of the phase velocity in the presence of thermal misbalance, on the exponent of the magnetic field. Also, a wave scenario of heating was considered, depending on the power index of the frequency spectrum of the emitter, which led to the instability of entropy waves and the stability of MA waves.