Topological Structure of Magnetic Flux Lines Generated by Thermal Convection in a Rotating Spherical Shell

"Topological structure and reconnection of magnetic flux lines are investigated by analyzing the numerical solution of the Boussinesq magneto-hydrodynamic equations in a rotating spherical shell. Five pairs of Taylor-Proudman vortex columns are generated and drift westward steadily. Magnetic field is intensified around the tops of these vortex columns. Magnetic flux lines connect east-west adjacent domains of intense magnetic field, which rnigrate eastward relative to the vortex columns. We describe the variation of topology of magnetic flux lines associated with this eastward migration.