Ejections of magnetic structures above a spherical wedge driven by a convective dynamo with differential rotation

Details Ejections of magnetic structures above a spherical wedge driven by a convective dynamo with differential rotation Ejections of magnetic structures above a spherical wedge driven by a convective dynamo with differential rotation

2011-12-02

arxiv.org/abs/1112.0505v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

24 pages, 17 figures, submitted to Solar Physics

Scientific paper

We combine a convectively driven dynamo in a spherical shell with a nearly isothermal density-stratified cooling layer that mimics some aspects of a stellar corona to study the emergence and ejections of magnetic field structures.This approach is an extension of earlier models where we employed forced turbulence simulations to generate magnetic fields. A spherical wedge is used which consists of a convection zone and an extended coronal region up to more than one and a half of the radius of the sphere. The wedge contains a quarter of the azimuthal extent of the sphere and $150\degr$ in latitude. The magnetic field is self-consistently generated by the turbulent motions due to convection beneath the surface. Magnetic fields are found to emerge at the surface and are ejected to the coronal part of the domain. These ejections occur in irregular intervals and are weaker than in earlier work. We tentatively associate these events with coronal mass ejections on the Sun, even though our model of the solar atmosphere is rather simplistic.

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