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The Role of Active Region Loop Geometry - I. How can it affect coronal seismology? View all abstracts by submitter

Mag Selwa   Submitted: 2010-10-28 05:38

We present numerical results of coronal loop oscillation excitation using a three dimensional MHD model of an idealized active region field. The active region is initialized as a potential dipole magnetic configuration with gravitationally stratified density and contains a loop with a higher density than its surroundings. We study different ways of excitation of vertical kink oscillations of this loop by velocity: as an initial condition, and as an impulsive excitation with a pulse of a given position, duration, and amplitude. We vary the geometry of the loop in the 3D MHD model and find that it affects both the period of oscillations and the synthetic observations (difference images) that we get from oscillations. Due to overestimated effective length of the loop in case of loops which have maximum separation between their legs above the footpoints (> 50% of observed loops) magnetic field obtained from coronal seismology can also be overestimated. The 3D MHD model shows how the accuracy of magnetic field strength determined from coronal seismology can be improved. We study the damping mechanism of the oscillations and find that vertical kink waves in 3D stratified geometry are damped mainly due to wave leakage in the horizontal direction.

Authors: M. Selwa, L. Ofman and S. K. Solanki
Projects: None

Publication Status: ApJ accepted
Last Modified: 2010-10-28 05:49
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