Dynamo model with thermal convection and free-rotating inner core

The 2.5D approach is used to solve the dynamo model in the Boussinesq approximation. Thermal convection in a fast rotating spherical shell with a free-rotating inner core is considered. In all cases the inner core rotates slightly faster than the outer boundary of the shell. The presented dynamo model reverses regularly without any external impulse, and the generated magnetic field has the typical dipole structure at the surface. However, the dipole is aligned rather with the equatorial plane and thus the model can be applied to magnetic fields of Neptune and Uranus.