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Damping of slow magnetoacoustic oscillations by the misbalance between heating and cooling processes in the solar corona
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Kolotkov, Dmitrii, Nakariakov, V. M. (Valery M.) and Zavershinskii, D. I. (2019) Damping of slow magnetoacoustic oscillations by the misbalance between heating and cooling processes in the solar corona. Astronomy and Astrophysics, 628 . A133. doi:10.1051/0004-6361/201936072 ISSN 0004-6361.
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WRAP-damping-slow-magnetoacoustic-oscillations-misbalance-between-heating-cooling-processes-solar-corona-Kolotkov-2019.pdf - Accepted Version - Requires a PDF viewer. Download (776Kb) | Preview |
Official URL: https://doi.org/10.1051/0004-6361/201936072
Abstract
Context. Rapidly decaying slow magnetoacoustic waves are regularly observed in the solar coronal structures, offering a promising tool for a seismological diagnostics of the coronal plasma, including its thermodynamical properties.
Aims. The effect of damping of standing slow magnetoacoustic oscillations in the solar coronal loops is investigated accounting for field-aligned thermal conductivity and a wave-induced misbalance between radiative cooling and some unspecified heating rates.
Methods. The non-adiabatic terms were allowed to be arbitrarily large, corresponding to the observed values. The thermal conductivity was taken in its classical form, and a power-law dependence of the heating function on the density and temperature was assumed. The analysis was conducted in the linear regime and in the infinite magnetic field approximation.
Results. The wave dynamics is found to be highly sensitive to the characteristic timescales of the thermal misbalance. Depending on certain values of the misbalance, timescales three regimes of the wave evolution were identified, namely the regime of a suppressed damping, enhanced damping in which the damping rate drops down to observational values, and acoustic over-stability. The specific regime is determined by the dependences of the radiative cooling and heating functions on thermodynamical parameters of the plasma in the vicinity of the perturbed thermal equilibrium.
Conclusions. The comparison of the observed and theoretically derived decay times and oscillation periods allows us to constrain the coronal heating function. For typical coronal parameters, the observed properties of standing slow magnetoacoustic oscillations could be readily reproduced with a reasonable choice of the heating function.
| Item Type: | Journal Article | |||||||||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
| Library of Congress Subject Headings (LCSH): | Sun -- Corona, Magnetohydrodynamics, Plasma waves, Astrophysics, Solar oscillations -- Research | |||||||||||||||
| Journal or Publication Title: | Astronomy and Astrophysics | |||||||||||||||
| Publisher: | EDP Sciences | |||||||||||||||
| ISSN: | 0004-6361 | |||||||||||||||
| Official Date: | 20 August 2019 | |||||||||||||||
| Dates: |
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| Volume: | 628 | |||||||||||||||
| Article Number: | A133 | |||||||||||||||
| DOI: | 10.1051/0004-6361/201936072 | |||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||
| Publication Status: | Published | |||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
| Date of first compliant deposit: | 29 July 2019 | |||||||||||||||
| Date of first compliant Open Access: | 30 July 2019 | |||||||||||||||
| RIOXX Funder/Project Grant: |
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