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The influence of the internal structuring of coronal loops on the properties of their damped transverse oscillations View all abstracts by submitter

Inigo Arregui   Submitted: 2007-02-08 07:37

The geometry and physical conditions in solar coronal loops are complicated and still not well understood. Recent high resolution observations, obtained with TRACE, indicate the existence of sub-resolution transverse structuring, not accessible to direct observation. This ingredient has not yet been taken into account in previous theoretical models used for the study of transversal coronal loop oscillations and their damping due to resonant conversion of energy. This study aims to assess the effect of the possibly unresolved internal structure of a coronal loop on the properties of its transverse oscillations and on the efficiency of resonant absorption as a damping mechanism of these oscillations. The equilibrium configuration of a single coronal loop with internal density structuring is modelled by considering the loop as being composed by two very close parallel identical coronal slabs in Cartesian geometry. The period of the oscillation and the damping time, for the resonantly damped fundamental kink mode, are computed. These quantities are then compared to those obtained for two models for a single equivalent slab without internal density structuring. We find that the period and the damping time of a coronal loop with internal density structuring change by less than 15%, when compared to the same oscillatory properties of a single coronal loop with either the same density contrast or a single coronal loop with the same total mass. Therefore the internal density structuring of a coronal loop does not affect very much its oscillatory properties. However, the sub-resolution structuring of a coronal loop, with different densities in its components or with different widths could vary these results.

Authors: I. Arregui, J. Terradas, R. Oliver, & J.L. Ballester

Publication Status: A&A, Vol. 466, 1145-1151 (2007)
Last Modified: 2007-04-26 02:46
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