Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-20
Mon.Not.Roy.Astron.Soc.377:711-718,2007
Astronomy and Astrophysics
Astrophysics
9 pages, 9 figures, and 2 tabels; MNRAS accepted
Scientific paper
10.1111/j.1365-2966.2007.11644.x
Increasing observations are becoming available about a relatively weak, but persistent, non-axisymmetric magnetic field co-existing with the dominant axisymmetric field on the Sun. It indicates that the non-axisymmetric magnetic field plays an important role in the origin of solar activity. A linear non-axisymmetric alpha2-Omega dynamo model is set up to discuss the characteristics of the axisymmetric m=0 and the first non-axisymmetric m=1 modes and to provide further the theoretical bases to explain the active longitude, flip-flop and other non-axisymmetric phenomena. The model consists of a updated solar internal differential rotation, a turbulent diffusivity varied with depth and an alpha-effect working at the tachocline in rotating spherical systems. The difference between the alpha2-Omega and the alpha-Omega models and the conditions to favor the non-axisymmetric modes with the solar-like parameters are also presented.
Jiang Jay J.
Wang Jing-Xiu
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