Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...462.1127s&link_type=abstract
Astronomy and Astrophysics, Volume 462, Issue 3, February II 2007, pp.1127-1135
Astronomy and Astrophysics
Astrophysics
24
Magnetohydrodynamics (Mhd), Sun: Corona, Sun: Oscillations
Scientific paper
Aims:We study wave leakage as a possible attenuation mechanism of coronal loop oscillations in the ideal MHD regime. Methods: We consider impulsively generated oscillations in solar coronal magnetic wave guides such as a straight slab and a curved arcade loop. The two-dimensional numerical model we implement includes the effects of nonlinearity and line curvature on attenuation of fast magnetosonic kink waves. Results: We show that these waves are more strongly attenuated in the arcade loop than in the slab and provide evidence that the curvature of magnetic field lines results in excess energy leakage. For parameters appropriate for a coronal loop the kink oscillation is too efficiently attenuated by energy leakage, suggesting that in the solar atmosphere wave leakage must be reduced compared to our simulations. We conclude that energy leakage is an efficient source of attenuation of coronal loop oscillations.
Murawski Kris
Selwa Malgorzata
Solanki Sami K.
Wang Tie-Jun
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