Convection and magnetic field generation in fully convective spheres

by Dr Wolfgang Dobler (Department of Physics and Astronomy, University of Calgary)

Monday 13 Nov 2006, 10:15 → 11:00 Europe/Stockholm

Nordita Seminar Room

Magnetohydrodynamic simulations of fully convective, rotating spheres with volume heating near the center and cooling at the surface are presented. The dynamo-generated magnetic field saturates at equipartition field strength near the surface. In the interior, the field is dominated by small-scale structures, but outside the sphere by the global scale. Azimuthal averages of the field reveal a large-scale field of smaller amplitude also inside the star. The internal angular velocity shows some tendency to be constant along cylinders and is ``anti-solar'' (fastest at the poles and slowest at the equator).