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Corrugation instability of a coronal arcade

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Klimushkin, D. Y., Nakariakov, V. M. (Valery M.), Mager, P. N. and Cheremnykh, O. K. (2017) Corrugation instability of a coronal arcade. Solar Physics, 292 (12). 184. doi:10.1007/s11207-017-1209-x

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Official URL: http://doi.org/10.1007/s11207-017-1209-x

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Abstract

AbstractWe analyse the behaviour of linear magnetohydrodynamic perturbations of a coronal arcade modelled by a half-cylinder with an azimuthal magnetic field and non-uniform radial profiles of the plasma pressure, temperature, and the field. Attention is paid to the perturbations with short longitudinal (in the direction along the arcade) wavelengths. The radial structure of the perturbations, either oscillatory or evanescent, is prescribed by the radial profiles of the equilibrium quantities. Conditions for the corrugation instability of the arcade are determined. It is established that the instability growth rate increases with decreases in the longitudinal wavelength and the radial wave number. In the unstable mode, the radial perturbations of the magnetic field are stronger than the longitudinal perturbations, creating an almost circularly corrugated rippling of the arcade in the longitudinal direction. For coronal conditions, the growth time of the instability is shorter than one minute, decreasing with an increase in the temperature. Implications of the developed theory for the dynamics of coronal active regions are discussed.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Sun -- Loop prominences, Magnetohydrodynamic waves
Journal or Publication Title: Solar Physics
Publisher: Springer Netherlands
ISSN: 1573-093X
Official Date: December 2017
Dates:
DateEvent
December 2017Published
28 November 2017Available
9 November 2017Accepted
Volume: 292
Number: 12
Article Number: 184
DOI: 10.1007/s11207-017-1209-x
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): ** From Springer Nature via Jisc Publications Router. ** History: received 19-10-2017; accepted 13-11-2017; epub 28-11-2017; collection 12-2017. ** Licence for this article: http://creativecommons.org/licenses/by/4.0/
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
Project II.16.1.3. Ministry of Education and Science of the Russian Federationhttp://dx.doi.org/10.13039/501100003443
16-12-10448Russian Science Foundationhttp://dx.doi.org/10.13039/501100006769
16-05-00254Russian Foundation for Basic Researchhttp://dx.doi.org/10.13039/501100002261
UNSPECIFIEDNational Academy of Sciences of Ukrainehttp://dx.doi.org/10.13039/501100004742

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