THE ROTATIONAL QUENCHING OF THE ROTATION-INDUCED KINETIC ALPHA-EFFECT

A theory of the non-diffusive anisotropic kinetic alpha-effect (''Gamm a-effect'') for density-stratified rotating turbulent fluids is develo ped. No limitations on the rotation rate are imposed and the fully non linear dependence of the Gamma-effect on the angular velocity is studi ed. When the Coriolis number, Omega = 2 tau(corr) Omega, is small the dimensionless ''dynamo number'', C-Gamma, characterising the power of the Gamma-effect, grows with Omega. The dependence, however, reaches a maximum for Omega'' similar or equal to 2. For still higher rotatio n rates C-Gamma decreases as 1/Omega. In opposition, the correspondin g number, C-alpha, of the hydromagnetic alpha(2)-dynamo problems remai ns finite for very large Omega. Hence, for fast rotation the hydrodyn amic Gamma-effect is small while the hydromagnetic alpha-effect remain s large. In consequence, the large-scale magnetic and velocity structu res are expected to be equal power in slowly rotating objects. In the rapid rotators, however, generation of the large-scale flows is proble matic.