An overshoot solar dynamo with a strong return meridional flow

作者：Bonanno Alfio^*

来源：Geophysical and Astrophysical Fluid Dynamics, 2013, 107(1-2): 11-19.

DOI：10.1080/03091929.2011.652104

• Dynamo
• Meridional circulation

The meridional circulation plays an essential role in determining the basic mechanism of the dynamo action in the case of a low eddy diffusivity. Flux-transport dynamos with strong return flow and a deep stagnation point are discussed in the case of a positive -effect located in the overshoot layer and a rotation law consistent with helioseismology. By means of a linear dynamo model, it will be shown that the migration of the toroidal belts at lower latitudes and the periods of the activity cycles are consistent with the observations. Moreover, at variance with previous investigations, the typical critical dynamo numbers of dipolar solutions are significantly smaller than those of quadrupolar solutions even in the regime of strong flow.

• 出版日期2013-2-1