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Damping rates of p-modes by an ensemble of randomly distributed thin magnetic flux tubes

Published online by Cambridge University Press:  26 August 2011

Andrew Gascoyne  and
Rekha Jain
Andrew Gascoyne
Affiliation:
Department of Applied Mathematics, University of Sheffield, UK email: app07adg@sheffield.ac.uk, R.Jain@sheffield.ac.uk
Rekha Jain
Affiliation:
Department of Applied Mathematics, University of Sheffield, UK email: app07adg@sheffield.ac.uk, R.Jain@sheffield.ac.uk
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Abstract

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The magnetohydrodynamic (MHD) sausage tube waves are excited in the magnetic flux tubes by p-mode forcing. These tube waves thus carry energy away from the p-mode cavity which results in the deficit of incident p-mode energy. We calculate the loss of incident p-mode energy as a damping rate of f- and p-modes. We calculate the damping rates of f- and p-modes by a model Sun consisting of an ensemble of many thin magnetic flux tubes with varying plasma properties and distributions. Each magnetic flux tube is modelled as axisymmetric, vertically oriented and untwisted. We find that the magnitude and the form of the damping rates are sensitive to the plasma-β of the tubes and the upper boundary condition used.

Keywords

Sun: magnetic fieldsSun: helioseismologySun: oscillationsMHDScattering
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 351 - 355
Copyright
Copyright © International Astronomical Union 2011

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