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Generation of Torsional Oscillations in the Sun

Published online by Cambridge University Press:  08 February 2017

Y.V. Vandakurov
Y.V. Vandakurov*
Affiliation:
A.F. Ioffe Physical Technical Institute Academy of Sciences of the USSR 194021, Leningrad, USSR

Abstract

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The hypothesis is considered that the torsional wave observed on the Sun is an eigenmode oscillation excited in the presence of a weak poloidal magnetic field. We derive asymptotic linear equations for a perturbation with a large number of nodes along the radius, assuming the rotation to be slow and the characteristic perturbation period to be much longer than the rotational period. The results of a preliminary numerical study of the stability of the torsional mode indicate that the superadiabaticity of the solar convection may contribute to the excitation of this mode. In the present work the approximation of harmonic radial dependence of the perturbation has been used.

Type
V. Large-scale Structure and Dynamics
Information
Symposium - International Astronomical Union , Volume 138: Solar Photosphere: Structure, Convection and Magnetic Fields , 1990 , pp. 333 - 340
Copyright
Copyright © Kluwer 1990 

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