MAGNETIC-FIELD AND ALPHA-EFFECT IN MODEL-Z

The main subject of the paper is to show how the shape and thickness o f an alpha-layer and the amplitude of the alpha-effect influence the s olution of model Z, especially the magnetic field energy (MFE). Soluti on of model Z with different input parameters allows us to conclude th at the larger the thickness of the alpha-layer, the greater the ratio of the MFE of the meridional to the MFE of the azimuthal field and, th erefore, the greater the efficiency of the alpha-effect, although the appropriate value of the amplitude of the alpha-effect is more difficu lt to find. The MFE tends to oscillate for a sufficiently thick alpha- layer if the amplitude of the alpha-effect is changed, but the oscilla tions are suppressed and MFE is again stabilized. If the thickness of the alpha-layer does not vary, the MFE of the azimuthal field relative to the MFE of the meridional field decreases with increasing amplitud e of the alpha-effect in certain narrow limits. The geostrophic shear does not change its character, and its maximum follows the maximum of alpha-effect in the layer.