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Damped oscillations of two interacting coronal loops

Published online by Cambridge University Press:  01 September 2007

I. Arregui ,
J. Terradas ,
R. Oliver  and
J. L. Ballester
I. Arregui
Affiliation:
Departament de Física, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain email: inigo.arregui@uib.es, jaume.terradas@uib.es, ramon.oliver@uib.es, dfsjlb0]@uib.es
J. Terradas
Affiliation:
Departament de Física, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain email: inigo.arregui@uib.es, jaume.terradas@uib.es, ramon.oliver@uib.es, dfsjlb0]@uib.es Centrum voor Plasma Astrofysica, K.U. Leuven, Celestijnenlaan 200B, B-3001 Heverlee, Belgium
R. Oliver
Affiliation:
Departament de Física, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain email: inigo.arregui@uib.es, jaume.terradas@uib.es, ramon.oliver@uib.es, dfsjlb0]@uib.es
J. L. Ballester
Affiliation:
Departament de Física, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain email: inigo.arregui@uib.es, jaume.terradas@uib.es, ramon.oliver@uib.es, dfsjlb0]@uib.es
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Abstract

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We present results on the oscillatory properties (periods, damping rates, and spatial distribution of perturbations) for resonantly damped oscillations in a system of two inhomogeneous coronal slabs and compare them to the properties found in single slab loop models. A system of two identical coronal loops is modelled, in Cartesian geometry, as being composed by two density enhancements. The linear magnetohydrodynamic (MHD) wave equations for oblique propagation of waves are solved and the damping due to resonant absorption is computed. Due to the interaction between the loops, the normal modes of oscillation present in a single slab split into symmetric and antisymmetric oscillations when a system of two identical slabs is considered. The frequencies of these solutions may differ from the single slab results when the distance between the loops is of the order of a few slab widths. Oblique propagation of waves weakens this interaction, since solutions become more confined to the edges of the slabs. The damping is strong for surface-like oscillations, while sausage body-like solutions are unaffected.

Keywords

MHDSun: coronaSun: magnetic fieldswaves
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. 133 - 139
Copyright
Copyright © International Astronomical Union 2008

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