3D MHD Simulations of Excitation and Damping of Vertical Kink Waves in Coronal Active Region Loops

Details 3D MHD Simulations of Excitation and Damping of Vertical Kink Waves in Coronal Active Region Loops 3D MHD Simulations of Excitation and Damping of Vertical Kink Waves in Coronal Active Region Loops

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..397..189s&link_type=abstract

First Results From Hinode ASP Conference Series, Vol. 397, Proceedings of the conference held 20-24 August, 2007, at Trinity Col

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present numerical results of a three dimensional MHD model of an idealized active region field. The active region is initialized as a force-free dipole magnetic configuration with gravitationally stratified density and contains a loop with a higher density than its surroundings. We study different ways of exciting vertical kink oscillations by velocity: as an initial condition, and as an impulsive excitation with a pulse of a given position, duration, and amplitude. These properties are varied in the parametric studies. We find that vertical kink oscillations amplitude is significantly amplified in comparison to horizontal kink oscillations amplitude for exciters located centrally (symmetrically) below the loop, which explains why the pure vertical kink mode is so rarely observed in comparison to the horizontally polarized one. We observe that vertical kink waves in 3D stratified geometry are damped mainly due to wave leakage. We compare our simulation with TRACE observational data and find qualitative agreement. We plan to search for vertical kink modes in Hinode data, and compare to our models.

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