Transitions in Rapidly Rotating Convection Driven Dynamos

Transitions in rapidly rotating convection driven dynamos.

Numerical simulations of dynamos in rotating Rayleigh-Bénard convection in plane layers are presented. Two different types of dynamos exist which obey different scaling laws for the amplitude of the magnetic field. The transition between the two occurs within a hydrodynamically uniform regime which can be classified as rapidly rotating convection.

Rotating convection-driven dynamos at low Ekman number.

We present a fully 3D self-consistent convection-driven dynamo model with reference to the geodynamo. A relatively low Ekman number regime is reached, with the aim of investigating the dynamical behavior at low viscosity. This regime is computationally very demanding, which has prompted us to adopt a plane layer model with an inclined rotation vector, and to make use of efficiently parallelized...

Tidally driven dynamos in a rotating sphere

Large-scale planetary or stellar magnetic fields generated by a dynamo effect are mostly attributed to flows forced by buoyancy forces in electrically conducting fluid layers. However, these large-scale fields may also be controlled by tides, as previously suggested for the star τ -boo, Mars or the Early Moon. By simulating a small local patch of a rotating fluid, Barker & Lithwick (2014) have ...

Parameter dependences of convection-driven dynamos in rotating spherical fluid shells

For the understanding of planetary and stellar dynamos an overview of the major parameter dependences of convection driven dynamos in rotating spherical fluid shells is desirable. Although the computationally accessible parameter space is limited, earlier work is extended with emphasis on higher Prandtl numbers and uniform heat flux condition at the outer boundary. The transition from dynamos d...

“Unusual Properties of Convection and Dynamos in Rotating Spherical Shells”