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A&A 394, L39-L42 (2002)
DOI: 10.1051/0004-6361:20021378
Letter
Coronal loop oscillations
An interpretation in terms of resonant absorption of quasi-mode kink oscillations
M. Goossens1, J. Andries1 and M. J. Aschwanden21 Centre for Plasma Astrophysics, K. U. Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
2 Lockheed Martin Advanced Technology Center, Solar and Astrophysics Lab., Hanover Street, Palo Alto, CA 94304, USA
(Received 21 August 2002 / Accepted 19 September 2002)
Abstract
Damped quasi-mode kink oscillations in cylindrical flux tubes
are capable of explaining the observed rapid damping of the coronal loop
oscillations when the ratio of the inhomogeneity length scale to the radius
of the loop is allowed to vary from loop to loop, without the need to
invoke anomalously low Reynolds numbers.
The theoretical expressions for the decay time by Hollweg & Yang (1998)
and Ruderman & Roberts (2002) are used to estimate the ratio of the length scale of
inhomogeneity compared to the loop radius for a collection of loop oscillations.
Key words: Sun: corona -- magnetic fields -- oscillations
Offprint request: J. Andries, jesse.andries@wis.kuleuven.ac.be
© ESO 2002