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An Isaac Newton Institute Workshop

MAGNETOHYDRODYNAMICS OF STELLAR INTERIORS <br> Supported by the European Commission, Sixth Framework Programme - <br> Marie Curie Conferences and Training Courses - MSCF-CT-2003-503674

Nonlinear dynamo action in rotating convection and shear

Author: Dr Andrew D Gilbert (Exeter)


(joint work with Pu Zhang, Andrew Soward, Keke Zhang).

Magnetic field amplification is studied in a rotating plane layer system. A shearing fluid flow is driven by motion of the bottom boundary and takes the form of an Ekman boundary layer. Above this layer, convection is driven. The combination of shear and convection amplifies magnetic field by means of an alpha-omega dynamo mechanism, and the saturation of magnetic fields is discussed by means of numerical simulations.