THE MEAN-FIELD DYNAMO MODEL

The 2D Parker’s mean-field dynamo equations with a various distributions of the α- and ω-effects are considered. We show that smooth profiles of α and ω can produce dipole configuration of the magnetic field with the realistic magnetic energy spectrum. We emphasize that fluctuating α-effect leads to increase of the magnetic energy at the small scales, breaking the dipole configu-ration of the field. The considered geostrophic profiles of α and ω correspond to the small-scale polarwards/equatorwards travelling waves with the small dipole field contribution. The same result is observed for the dynamic form of the α-quenching, where two branches of the weak and strong solution coexist