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3-D numerical simulations of coronal loops oscillations View all abstracts by submitter

Mag Selwa   Submitted: 2009-12-01 04:01

We present numerical results of 3-D MHD model of a dipole active region field containing a loop with a higher density than its surroundings. We study different ways of excitation of vertical kink oscillations by velocity erturbation: 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 the amplitude of vertical kink oscillations is significantly amplified in comparison to horizontal kink oscillations for exciters located centrally (symmetrically) below the loop, but not if the exciter is located a significant distance to the side of the loop. This explains why the pure vertical kink mode is so rarely observed in comparison to the horizontally polarized one. We discuss the role of curved magnetic field lines and the pulse overlapping at one of the loop's footpoints in 3-D active regions (AR's) on the excitation and the damping of slow standing waves. We find that footpoint excitation becomes more efficient in 3-D curved loops than in 2-D curved arcades and that slow waves can be excited within an interval of time that is comparable to the observed one wave-period due to the combined effect of the pulse inside and outside the loop. Additionally, we study the effect of AR topology on the excitation and trapping of loop oscillations. We find that a perturbation acting directly on a single loop excites oscillations, but results in an increased leakage compared to excitation of oscillations in an AR field by an external source.

Authors: M. Selwa, L. Ofman
Projects: None

Publication Status: Annales Geophysicae (published)
Last Modified: 2010-01-22 06:17
Go to main E-Print page  The role of active region topology on excitation, trapping and damping of coronal loop oscillations  Elementary Energy Release Events in Flaring Loops: Effects of Chromospheric Evaporation on X-rays  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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