Computations of Convection Driven Spherical Dynamos

The geodynamo, i.e. the process by which the Earth’s magnetic field is generated in the liquid outer core of the Earth, is generally regarded as one of the fundamental problems of geophysics. It is the prevailing opinion among geophysicists that thermal and chemical buoyancy originating in connection with the solidification of the inner core and the general cooling of the Earth cause convection flows in the outer core which consists of liquid iron together with some lighter elements. The mechanical energy of the convection flow provides the energy for the sustenance of the magnetic field against Ohmic losses. The mechanism by which this transfer of energy is accomplished is called a homogeneous dynamo in order to distinguish it from the common inhomogeneous dynamos used in technical applications.