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A new look at the frequency-dependent damping of slow-mode waves in the solar corona

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Kolotkov, Dmitrii Y. and Nakariakov, Valery M. (2022) A new look at the frequency-dependent damping of slow-mode waves in the solar corona. Monthly Notices of the Royal Astronomical Society: Letters, 514 (1). L51-L55. doi:10.1093/mnrasl/slac054

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Official URL: https://doi.org/10.1093/mnrasl/slac054

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Abstract

Being directly observed in the Doppler shift and imaging data and indirectly as quasi-periodic pulsations in solar and stellar flares, slow magnetoacoustic waves offer an important seismological tool for probing many vital parameters of the coronal plasma. A recently understood active nature of the solar corona for magnetoacoustic waves, manifested through the phenomenon of wave-induced thermal misbalance, led to the identification of new natural mechanisms for the interpretation of observed properties of waves. A frequency-dependent damping of slow waves in various coronal plasma structures remains an open question, as traditional wave damping theories fail to match observations. We demonstrate that accounting for the back-reaction caused by thermal misbalance on the wave dynamics leads to a modification of the relationship between the damping time and oscillation period of standing slow waves, prescribed by the linear theory. The modified relationship is not of a power-law form and has the equilibrium plasma conditions and properties of the coronal heating/cooling processes as free parameters. It is shown to readily explain the observed scaling of the damping time with period of standing slow waves in hot coronal loops. Functional forms of the unknown coronal heating process, consistent with the observed frequency-dependent damping, are seismologically revealed.

Item Type: Journal Item
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, Solar oscillations, Magnetohydrodynamic waves
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society: Letters
Publisher: Oxford University Press (OUP)
ISSN: 1745-3933
Official Date: July 2022
Dates:
DateEvent
July 2022Published
13 May 2022Available
10 May 2022Accepted
Volume: 514
Number: 1
Page Range: L51-L55
DOI: 10.1093/mnrasl/slac054
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©: 2022 The Author's Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 2 August 2022
Date of first compliant Open Access: 2 August 2022
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
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