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Excitation of vertical kink waves in a solar coronal arcade loop by a periodic driver View all abstracts by submitter

Mag Selwa   Submitted: 2010-07-13 09:12

Aims: We study an oscillatory driver as a possible excitation mechanism of vertical kink loop oscillations in the ideal MHD regime. Methods: We consider a solar coronal magnetic arcade with a dense photospheric layer. The two-dimensional numerical model that we implement includes the effects of nonlinearity and line curvature on the excitation and attenuation of fast magnetosonic kink waves. We investigate the effects of a driven sinusoidal pressure pulse and compare it with the impulsive excitation by a pressure pulse that impacts the overlying loop. Results: Our numerical simulations reveal wave signatures that are reminiscent of vertical loop oscillations seen in TRACE observational data. Conclusions: We conclude that attenuation of vertical kink oscillations can be reduced to the value observed by adopting an oscillatory instead of an impulsive excitation. An oscillatory driver also naturally explains why only a small subset of all loops is excited to oscillate transversally in an active region.

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

Publication Status: A&A 512 (2010) A76
Last Modified: 2010-07-13 12:29
Go to main E-Print page  Evolution of twist-shear and dip-shear during X-class flare of 13 December 2006: Hinode observations  Seismology of Standing Kink Oscillations of Solar Prominence Fine Structures  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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