Leaky and resonantly damped flux tube modes reconsidered

Details Leaky and resonantly damped flux tube modes reconsidered Leaky and resonantly damped flux tube modes reconsidered

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...342..863s&link_type=abstract

Astronomy and Astrophysics, v.342, p.863-866 (1999)

Astronomy and Astrophysics

Astrophysics

18

Magnetohydrodynamics (Mhd), Sun: Oscillations, Sun: Photosphere, Sun: Sunspots

Scientific paper

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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