Why does the Sun's torsional oscillation begin before the sunspot cycle?

Details Why does the Sun's torsional oscillation begin before the sunspot cycle? Why does the Sun's torsional oscillation begin before the sunspot cycle?

2009-07-28

arxiv.org/abs/0907.4842v1

Phys.Rev.Lett.102:041102,2009; Erratum-ibid.Lett.103:099902,2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages 3 figures. Unfortunately there were some errors in the figures which appeared in PRL. We are putting the corrected fig

Scientific paper

10.1103/PhysRevLett.102.041102

Although the Sun's torsional oscillation is believed to be driven by the Lorentz force associated with the sunspot cycle, this oscillation begins 2--3 yr before the sunspot cycle. We provide a theoretical explanation of this with the help of a solar dynamo model having a meridional circulation penetrating slightly below the bottom of the convection zone, because only in such dynamo models the strong toroidal field forms a few years before the sunspot cycle and at a higher latitude.

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