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Coupled Alfvén and kink oscillations in an inhomogeneous corona

Published online by Cambridge University Press:  08 June 2011

David J. Pascoe ,
Andrew N. Wright  and
Ineke De Moortel
David J. Pascoe
Affiliation:
School of Mathematics and Statistics, University of St Andrews, St Andrews, KY16 9SS, United Kingdom email: [email protected]
Andrew N. Wright
Affiliation:
School of Mathematics and Statistics, University of St Andrews, St Andrews, KY16 9SS, United Kingdom email: [email protected]
Ineke De Moortel
Affiliation:
School of Mathematics and Statistics, University of St Andrews, St Andrews, KY16 9SS, United Kingdom email: [email protected]
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Abstract

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We perform 3D numerical simulations of footpoint-driven transverse waves propagating in a low β plasma. The presence of inhomogeneities in the density profile leads to the coupling of the driven kink mode to Alfvén modes by resonant absorption. The decay of the propagating kink wave as energy is transferred to the local Alfvén mode is in good agreement with a modified interpretation of the analytical expression derived for standing kink modes. This coupling may account for the damping of transverse velocity perturbation waves which have recently been observed to be ubiquitous in the solar corona.

Keywords

MHDSun: atmosphereSun: coronaSun: magnetic fieldsSun: oscillationswaves
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S274: Advances in Plasma Astrophysics , September 2010 , pp. 129 - 132
Copyright
Copyright © International Astronomical Union 2011

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