Coupling between radial and torsional oscillations in a magnetized plasma and possible stellar applications

Details Coupling between radial and torsional oscillations in a magnetized plasma and possible stellar applications Coupling between radial and torsional oscillations in a magnetized plasma and possible stellar applications

2007-03-09

arxiv.org/abs/astro-ph/0703206v1

Astrophys.J.663:553-559,2007

Astronomy and Astrophysics

Astrophysics

10 pages, 2 figures, accepted in ApJ

Scientific paper

10.1086/517864

The weakly non-linear interaction of slow magnetoacoustic and torsional Alfven waves propagating along an unperturbed poloidal magnetic field in a stellar interior is studied in the high plasma beta limit. It is shown that slow magnetoacoustic waves parametrically drive torsional modes with the half frequency and wave number. Therefore global slow magnetoacoustic waves which have a radial velocity polarization, may amplify the torsional oscillations. Possible applications of this mechanism to the Sun and binary stars are briefly discussed.

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