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The solar corona as an active medium for magnetoacoustic waves

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Kolotkov, Dmitrii, Zavershinskii, D. I. and Nakariakov, V. M. (Valery M.) (2021) The solar corona as an active medium for magnetoacoustic waves. Plasma Physics and Controlled Fusion, 63 (12). 124008. doi:10.1088/1361-6587/ac36a5 ISSN 1361-6587.

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Official URL: https://doi.org/10.1088/1361-6587/ac36a5

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Abstract

The presence and interplay of continuous cooling and heating processes maintaining the corona of the Sun at the observed one million K temperature were recently understood to have crucial effects on the dynamics and stability of magnetoacoustic (MA) waves. These essentially compressive waves perturb the coronal thermal equilibrium, leading to the phenomenon of a wave-induced thermal misbalance (TM). Representing an additional natural mechanism for the exchange of energy between the plasma and the wave, TM makes the corona an active medium for MA waves, so that the wave can not only lose but also gain energy from the coronal heating source (similarly to burning gases, lasers and masers). We review recent achievements in this newly emerging research field, focussing on the effects that slow-mode MA waves experience as a back-reaction of this perturbed coronal thermal equilibrium. The new effects include enhanced frequency-dependent damping or amplification of slow waves, and effective, not associated with the coronal plasma non-uniformity, dispersion. We also discuss the possibility to probe the unknown coronal heating function by observations of slow waves and linear theory of thermal instabilities. The manifold of the new properties that slow waves acquire from a thermodynamically active nature of the solar corona indicate a clear need for accounting for the effects of combined coronal heating/cooling processes not only for traditional problems of the formation and evolution of prominences and coronal rain, but also for an adequate modelling and interpretation of magnetohydrodynamic waves.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Sun -- Corona , Sun -- Corona -- Magnetic fields, Solar magnetic fields , Magnetohydrodynamic waves, Spin waves
Journal or Publication Title: Plasma Physics and Controlled Fusion
Publisher: IOP Publishing
ISSN: 1361-6587
Official Date: 16 November 2021
Dates:
DateEvent
16 November 2021Published
4 November 2021Accepted
Volume: 63
Number: 12
Article Number: 124008
DOI: 10.1088/1361-6587/ac36a5
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 29 November 2021
Date of first compliant Open Access: 29 November 2021
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/T000252/1 [STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
FSSS-2020-0014, 0023-2019-0003Ministry of Science and Higher Education of the Russian FederationUNSPECIFIED
075-GZ/C3569/278 Ministry of Science and Higher Education of the Russian FederationUNSPECIFIED
21-12-00195Rossiĭskiĭ gumanitarnyĭ nauchnyĭ fondhttp://viaf.org/viaf/264254153
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