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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
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 | |||||||||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||||||||
| Divisions: | Faculty of 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: |
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| Volume: | 292 | |||||||||||||||
| Number: | 12 | |||||||||||||||
| Article Number: | 184 | |||||||||||||||
| DOI: | 10.1007/s11207-017-1209-x | |||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||
| Publication Status: | Published | |||||||||||||||
| Publisher Statement: | ** 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: |
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