Nonaxisymmetric Oscillations of Thin Twisted Magnetic Tubes

Details Nonaxisymmetric Oscillations of Thin Twisted Magnetic Tubes Nonaxisymmetric Oscillations of Thin Twisted Magnetic Tubes

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007soph..246..119r&link_type=abstract

Solar Physics, Volume 246, Issue 1, pp.119-131

Physics

19

Scientific paper

In this paper we study nonaxisymmetric oscillations of thin twisted magnetic tubes taking the density variation along the tube into account. We use the approximation of the zero-beta plasma. The magnetic field outside the tube is straight and homogeneous; however, it is twisted inside the tube. We assume that the azimuthal component of the magnetic field is proportional to the distance from the tube axis and that the tube is only weakly twisted ( i.e., the ratio of the azimuthal and axial components of the magnetic field is small). Using the asymptotic analysis we show that the eigenmodes and eigenfrequencies of the kink and fluting oscillations are described by a classical Sturm - Liouville problem for a second-order ordinary differential equation. The main result is that the twist does not affect the kink mode.

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