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Propagating coupled Alfvén and kink oscillations in an arbitrary inhomogeneous corona

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pascoe2011astrophysicj73.pdf (1.372Mb)
Date
10/04/2011
Author
Pascoe, David James
Wright, Andrew Nicholas
De Moortel, Ineke
Keywords
Magnetohydrodynamics (MHD)
Sun: atmosphere
Sun: corona
Sun: magnetic topology
Sun: oscillations
Waves
QB Astronomy
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Abstract
Observations have revealed ubiquitous transverse velocity perturbation waves propagating in the solar corona. We perform three-dimensional numerical simulations of footpoint-driven transverse waves propagating in a low β plasma. We consider the cases of distorted cylindrical flux tubes and a randomly generated inhomogeneous medium. When density structuring is present, mode coupling in inhomogeneous regions leads to the coupling of the kink mode to the Alfvén mode. The decay of the propagating kink wave is observed as energy is transferred to the local Alfvén mode. In all cases considered, modest changes in density were capable of efficiently converting energy from the driving footpoint motion to localized Alfv´en modes. We have demonstrated that mode coupling efficiently couples propagating kink perturbations to Alfvén modes in an arbitrary inhomogeneous medium. This has the consequence that transverse footpoint motions at the base of the corona will deposit energy to Alfvén modes in the corona.
Citation
Pascoe , D J , Wright , A N & De Moortel , I 2011 , ' Propagating coupled Alfvén and kink oscillations in an arbitrary inhomogeneous corona ' , Astrophysical Journal , vol. 731 , no. 1 , 73 . https://doi.org/10.1088/0004-637X/731/1/73
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.1088/0004-637X/731/1/73
ISSN
0004-637X
Type
Journal article
Rights
© 2011. The American Astronomical Society. All rights reserved
Description
D.J.P. acknowledges financial support from STFC. I.D.M. acknowledges support of a Royal Society University Research Fellowship.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/4755

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