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Formation of quasi-periodic slow magnetoacoustic wave trains by the heating/cooling misbalance

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Zavershinskii, D. I., Kolotkov, Dmitrii, Nakariakov, V. M. (Valery M.), Molevich, N. E. and Ryashchikov, D. S. (2019) Formation of quasi-periodic slow magnetoacoustic wave trains by the heating/cooling misbalance. Physics of Plasmas, 26 (8). 082113 . doi:10.1063/1.5115224

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Official URL: https://doi.org/10.1063/1.5115224

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Abstract

Slow magnetoacoustic waves are omnipresent in both natural and laboratory plasma systems. The wave-induced misbalance between plasma cooling and heating processes causes the amplification or attenuation, and also dispersion, of slow magnetoacoustic waves. The wave dispersion could be attributed to the presence of characteristic time scales in the system, connected with the plasma heating or cooling due to the competition of the heating and cooling processes in the vicinity of the thermal equilibrium. We analysed linear slow magnetoacoustic waves in a plasma in a thermal equilibrium formed by a balance of optically thin radiative losses, field-align thermal conduction, and an unspecified heating. The dispersion is manifested by the dependence of the effective adiabatic index of the wave on the wave frequency, making the phase and group speeds frequency-dependent. The mutual effect of the wave amplification and dispersion is shown to result into the occurrence of an oscillatory pattern in an initially broadband slow wave, with the characteristic period determined by the thermal misbalance time scales, i.e. by the derivatives of the combined radiation loss and heating function with respect to the density and temperature, evaluated at the equilibrium. This effect is illustrated by estimating the characteristic period of the oscillatory pattern, appearing because of thermal misbalance in the plasma of the solar corona. It is found that by an order of magnitude the period is about the typical periods of slow magnetoacoustic oscillations detected in the corona.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Plasma waves , Thermodynamic equilibrium , Sun -- Corona -- Magnetic fields
Journal or Publication Title: Physics of Plasmas
Publisher: American Institute of Physics
ISSN: 1070-664X
Official Date: 19 July 2019
Dates:
DateEvent
19 July 2019Available
18 July 2019Accepted
Date of first compliant deposit: 23 July 2019
Volume: 26
Number: 8
Article Number: 082113
DOI: 10.1063/1.5115224
Status: Peer Reviewed
Publication Status: Published
Publisher Statement: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/P000320/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
18-29-21016[RFBR]Russian Foundation for Basic Researchhttp://dx.doi.org/10.13039/501100002261
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