Abstract
The damping of fast kink oscillations of solar coronal loops attributable to the radiation of MHD waves into the surroundings is considered in the thin-tube approximation. The oscillation damping decrement is calculated both by using a new energy method and by solving the dispersion equation for magnetic-tube eigenmodes. The two approaches are in good agreement under appropriate assumptions. The damping is negligible if MHD waves are radiated perpendicular to the magnetic field. The low Q factor of the loop oscillations in active regions found with the TRACE space telescope is associated with the generation of running waves that propagate along magnetic field lines.
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Translated from Pis’ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 27, No. 11, 2001, pp. 859–866.
Original Russian Text Copyright © 2001 by Tsap, Kopylova.
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Tsap, Y.T., Kopylova, Y.G. Acoustic damping of fast kink oscillations of coronal loops. Astron. Lett. 27, 737–744 (2001). https://doi.org/10.1134/1.1415864
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DOI: https://doi.org/10.1134/1.1415864