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Effect of local thermal equilibrium misbalance on long-wavelength slow magnetoacoustic waves
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Nakariakov, V. M. (Valery M.), Afanasyev, A. N., Kumar, S. and Moon, Y.-J. (2017) Effect of local thermal equilibrium misbalance on long-wavelength slow magnetoacoustic waves. The Astrophysical Journal, 849 (1). 62. doi:10.3847/1538-4357/aa8ea3
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Official URL: http://dx.doi.org/10.3847/1538-4357/aa8ea3
Abstract
Evolution of slow magnetoacoustic waves guided by a cylindrical magnetic flux tube that represents a coronal loop or plume, is modeled accounting for the effects of finite gas pressure, weak nonlinearity, dissipation by thermal conduction and viscosity, and the misbalance between the cooling by optically thin radiation and unspecified heating of the plasma. An evolutionary equation of the Burgers–Malthus type is derived. It is shown that the cooling/heating misbalance, determined by the derivatives of the combined radiative cooling and heating function, with respect to the density, temperature, and magnetic field at the thermal equilibrium affect the wave rather strongly. This effect may either cause additional damping, or counteract it, or lead to the gradual amplification of the wave. In the latter case, the coronal plasma acts as an active medium for the slow magnetoacoustic waves. The effect of the cooling/heating misbalance could be important for coronal slow waves, and could be responsible for certain discrepancies between theoretical results and observations, in particular, the increased or decreased damping lengths and times, detection of the waves at certain heights only, and excitation of compressive oscillations. The results obtained open up a possibility for the diagnostics of the coronal heating function by slow magnetoacoustic waves.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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| Divisions: | Faculty of Science > Physics | ||||||||||||
| Library of Congress Subject Headings (LCSH): | Magnetohydrodynamic waves, Solar atmosphere, Sun -- Corona, Solar oscillations | ||||||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||||||
| ISSN: | 0004-637X | ||||||||||||
| Official Date: | 31 October 2017 | ||||||||||||
| Dates: |
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| Volume: | 849 | ||||||||||||
| Number: | 1 | ||||||||||||
| Article Number: | 62 | ||||||||||||
| DOI: | 10.3847/1538-4357/aa8ea3 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
| RIOXX Funder/Project Grant: |
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