To study the compressive waves observed in the solar corona, an approach is proposed based on the theory of nonadiabatic acoustic waves whose behavior is determined by the properties of thermal conductivity, constant specific heating, and radiative cooling of the coronal plasma. The periods observed in the spectra of compressive waves have characteristic values of 20–30 min, which usually change several times within a few hours. This challenges the generally accepted interpretation of the phenomenon called compressive waves. We have shown that the appearance of a short and a long period in an acoustic disturbance can be explained by considering a superposition of acoustic waves with the above-mentioned properties in the form of a localized pulse. The observed compressive waves can be represented as a sequence of individual acoustic disturbances generated at the base of the corona. They carry information about small-scale nonstationary processes in the lower atmosphere and can be used to study it.
Derteev et al. (Mon,) studied this question.