Leaky and resonantly damped flux tube modes reconsidered

TitleLeaky and resonantly damped flux tube modes reconsidered
Publication TypeJournal Article
Year of Publication1999
AuthorsH. Stenuit, W.J Tirry, R. Keppens, M. Goossens
JournalAstronomy & Astrophysics
Date PublishedFeb
ISBN Number0004-6361

In this research note the results for the eigenfrequencies of the uniform and non-uniform magnetic flux tubes of Stenuit et al. (1998) are reconsidered. In that paper it is shown that the eigenfrequencies may have a damping rate due to two mechanisms causing a loss of energy. In non-uniform flux tubes the eigenmodes can be damped by resonant absorption. The other mechanism is leakage of wave energy into the surroundings, which can occur for both uniform and non-uniform flux tubes. We point out that the dispersion relations obtained by Stenuit et al. are correct for leaky and undamped non-leaky modes, but are not correct for resonantly damped non-leaky modes.



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