Transitions in rapidly rotating convection driven dynamos
  Numerical simulations of dynamos in rotating Rayleigh-B\'enard convection in plane layers are presented. Two different types of dynamos exist which obey different scaling laws for the amplitude of the magnetic field. The transition between the two occurs within a hydrodynamically uniform regime which can be classified as rapidly rotating convection. 
A. Tilgner
physics.flu-dyn physics.geo-ph