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MHD waves at a spherical interface modelling coronal global EIT waves

Published online by Cambridge University Press:  01 September 2007

M. Douglas  and
I. Ballai
M. Douglas
Affiliation:
SP2RC, Department of Applied Mathematics, University of Sheffield, Sheffield S3 7RH, UK email: mark.douglas@sheffield.ac.uk; i.ballai@sheffield.ac.uk
I. Ballai
Affiliation:
SP2RC, Department of Applied Mathematics, University of Sheffield, Sheffield S3 7RH, UK email: mark.douglas@sheffield.ac.uk; i.ballai@sheffield.ac.uk
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Abstract

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Energetically eruptive events such as flares and coronal mass ejections (CMEs) are known to generate global waves, propagating over large distances, sometimes comparable to the solar radius. In this contribution EIT waves are modelled as waves propagating at a spherical density interface in the presence of a radially expanding magnetic field. The generation and propagation of EIT waves is studied numerically for coronal parameters. Simple equilibria allow the explanation of the coronal dimming caused by EIT waves as a region of rarified plasma created by a siphon flow.

Keywords

waveshydrodynamicsSun: CoronaSun: oscillations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S247: Waves & Oscillations in the Solar Atmosphere: Heating and Magneto-Seismology , September 2007 , pp. 251 - 254
Copyright
Copyright © International Astronomical Union 2008

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