Toroidal Field Reversals and the Axisymmetric Tayler Instability

Details Toroidal Field Reversals and the Axisymmetric Tayler Instability Toroidal Field Reversals and the Axisymmetric Tayler Instability

2011-08-14

arxiv.org/abs/1108.2906v1

ApJ, 735, 100 2011

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

accepted at ApJ

Scientific paper

We present axisymmetric numerical simulations of the solar interior, including the convection zone and an extended radiative interior. We find that differential rotation in the convection zone induces a toroidal field from an initially purely poloidal field. This toroidal field becomes unstable to the axisymmetric Tayler instability and undergoes equatorward propagating toroidal field reversals. These reversals occur in the absence of a dynamo and without accompanying poloidal field reversals. The nature and presence of such reversals depends sensitively on the initial poloidal field strength imposed, with north-south symmetric reversals only seen at a particular initial field strength. Coupled with a dynamo mechanism which regenerates the poloidal field this could be one ingredient in the sunspot cycle.

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