Affiliation:
1. Department of Theoretical Physics, Kalmyk State University, Pushkin’s st., 11, Elista 358000, Russia
Abstract
The behavior of acoustic waves in a rarefied high-temperature plasma is studied; as an example, the plasma of the solar corona is considered. Effects of thermal conductivity and a heating/radiative loss are taken into account; data on a temperature distribution of a radiation intensity obtained from the CHIANTI 10 code are used. The classical Spitzer expression for a full-ionized plasma is used for the thermal conductivity. Based on the found values of the radiation-loss function, the cubic spline method is used to construct an approximate analytical expression necessary for studying linear waves. A dispersion relation is obtained, and a frequency, a phase speed, and a damping coefficient are found. Dispersion and damping properties are considered for a temperature of about 106 K and a particle density of about 1015m−3, which are typical for the coronal plasma. In sum, superiority in the dispersion and damping of the thermal conduction is shown; the heating and radiation loss manifest themselves at large wavelengths. In accordance with general results by Field, a condition was found under which the acoustic oscillations become unstable. It is shown that at certain values of the temperature and density, the wave damping is dominated by the heating/radiative loss misbalance. Thus, the earlier results on mechanisms of damping of observed acoustic waves in the solar corona are refined here.
Funder
Ministry of Science and Higher Education of the Russian Federation
Subject
General Physics and Astronomy
Reference35 articles.
1. Intensity oscillations observed with Hinode near the south pole of the Sun: Leakage of low frequency magneto-acoustic waves into the solar corona;Srivastava;Astron. Astrophys.,2008
2. Longitudinal waves in coronal loops;Space Sci. Rev.,2009
3. Propagating MHD waves in coronal holes;Banerjee;Space Sci. Rev.,2011
4. Keiling, A., Lee, D.-H., and Nakariakov, V.M. (2016). Low-Frequency Waves in Space Plasmas, John Wiley & Sons, Inc.
5. Compressive oscillations in hot coronal loops: Are sloshing oscillations and standing slow waves independent?;Astrophys. J.,2021
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献