On the Nonlinear Effects of Magnetoacoustic Perturbations in Optically Thin Quasi-Isentropic Plasmas |
| A. Perelomova and F. Ratkowski
Gdańsk University of Technology, Faculty of Applied Physics and Mathematics, G. Narutowicza 11/12, 80-233 Gdańsk, Poland |
| Received: April 4, 2017; In final form: November 2, 2017 |
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| Nonlinear effects of planar magnetosound perturbations in a plasma are discussed. Plasma is non-adiabatic due to optically thin radiation and external heating. For these reasons, thermal instability of a plasma may appear which makes it acoustically active. The plasma is assumed to be initially homogeneous ideal gas with infinite electrical conductivity permeated by a straight magnetic field which is orthogonal to the trajectories of gas particles. The instantaneous dynamic equations which describe nonlinear effects of intense sound in quasi-isentropic plasma, are derived. Nonlinear interaction of periodic and aperiodic magnetoacoustic perturbations with the non-wave modes, are discussed. The conclusions concern dissipative or active behavior of magnetoacoustic perturbations which is determined by the kind of the heating-cooling function. |
DOI: 10.12693/APhysPolA.133.194 PACS numbers: 43.25.-x, 43.25.Nm |