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Damping of standing slow waves in hot coronal loops

Published online by Cambridge University Press:  01 September 2007

Leonardo Di G. Sigalotti ,
César A. Mendoza-Briceño  and
Marialejandra Luna-Cardozo
Leonardo Di G. Sigalotti
Affiliation:
Instituto Venezolano de Investigaciones Científicas (IVIC), Centro de Física, Laboratorio de Física de Fluidos y Plasmas, Caracas-Venezuela email: [email protected]
César A. Mendoza-Briceño
Affiliation:
Centro de Física Fundamental, Facultad de Ciencias, Universidad de los Andes, Merida-Venezuela email: [email protected]
Marialejandra Luna-Cardozo
Affiliation:
SP2RC, Department of Applied Mathematics, University of Sheffield, Sheffield S3 7RH, UK email: [email protected]
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Abstract

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The damping of standing slow mode oscillations in hot (T > 6 MK) coronal loops is described in the linear limit. The effects of energy dissipation by thermal conduction, viscosity, and radiative losses and gains are examined for both stratified and nonstratified loops. We find that thermal conduction acts on the way of increasing the period of the oscillations over the sound crossing time, whereas the decay times are mostly determined by viscous dissipation. Thermal conduction alone results in slower damping of the density and velocity waves compared to the observations. Only when viscosity is added do these waves damp out at the same rate of the observed SUMER loop oscillations. In the linear limit, the periods and decay times are barely affected by gravity.

Keywords

Sun: coronaSun: oscillations(magnetohydrodynamics:) MHDwaves
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. 303 - 311
Copyright
Copyright © International Astronomical Union 2008

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