Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph..100..125r&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 100, Oct. 1985, p. 125-140.
Physics
11
Dynamo Theory, Solar Activity, Solar Magnetic Field, Helical Flow, Solar Cycles, Solar Oscillations, Solar Rotation
Scientific paper
The basic features of the solar activity mechanism are explained in terms of the dynamo theory of mean magnetic fields. The field generation sources are the differential rotation and the mean helicity of turbulent motions in the convective zone. A nonlinear effect of the magnetic field upon the mean helicity results in stabilizing the amplitude of the 22-year oscillations and forming a basic limiting cycle. When two magnetic modes (with dipole and quadrupole symmetry) are excited, nonlinear beats appear which may be related to the secular cycle modulation. The solution of the nonlinear non-axisymmetric problem needs to overcome serious mathematical difficulties and is yet to be found.
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