Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006chjaa...6..227j&link_type=abstract
Chinese Journal of Astronomy and Astrophysics, Volume 6, Issue 2, pp. 227-236 (2006).
Astronomy and Astrophysics
Astrophysics
5
Scientific paper
Using the Chebyshev-tau method, the generation of oscillatory non-axisymmetric stellar magnetic fields by the α2-dynamo is studied in spherical geometry. Following the boundary conditions given by Schubert & Zhang, the spherical α2-dynamo consists of a fully convective spherical shell with inner radius ri and outer radius ro. A comparison of the critical dynamo numbers of axisymmetric and phi-dependent modes for different thicknesses of the convective shell and different α-profiles leads to the following qualitative results: (i) when the angular factor of α-profile is sinnθ cos θ (n = 1,2,4) the solutions of the α2-dynamo are oscillatory and non-axisymmetric, (ii) the thinner the convective shell, the more easily is the non-axisymmetric mode excited and the higher is the latitudinal wave number, (iii) the thickness of the outer convective shell has an effect on the symmetries of the magnetic fields.
Jiang Jie
Wang Jing-Xiu
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