Oscillatory migrating magnetic fields in helical turbulence in spherical domains

Details Oscillatory migrating magnetic fields in helical turbulence in spherical domains Oscillatory migrating magnetic fields in helical turbulence in spherical domains

2009-01-15

arxiv.org/abs/0901.2364v3

Astrophys. J.719:L1-L4, 2010

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Consistent with the published verstion (emulateapj)

Scientific paper

10.1088/2041-8205/719/1/L1

We present direct numerical simulations of the equations of compressible magnetohydrodynamics in a wedge-shaped spherical shell, without shear, but with random helical forcing which has negative (positive) helicity in the northern (southern) hemisphere. We find a large-scale magnetic field that is nearly uniform in the azimuthal direction and approximately antisymmetric about the equator. Furthermore, the large-scale field in each hemisphere oscillates on nearly dynamical time scales with reversals of polarity and equatorward migration. Corresponding mean-field models also show similar migratory oscillations with a frequency that is nearly independent of the magnetic Reynolds number. This mechanism may be relevant for understanding equatorward migration seen in the solar dynamo.

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