太陽の磁束輸送ダイナモにおける表面乱流拡散の役割(環境・地球・宇宙宇宙・惑星(1),一般講演)

概要

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A revision to the flux-transport dynamo model for the solar sunspot cycle is proposed and is demonstrated by using the axisymmetric kinematic simulations. The flux-transport dynamo has succeeded to explain the general cyclic behaviors of the sunspots. It has been known, however, that it failed to avoid the strong polar surface field and the strong toroidal field at the base near the high latitude which are both non-observed features. We propose a new regime of the flux-transport dynamo model by assuming an additional intense diffusivity profile near the surface. The surface poloidal field generated by the alpha-effect is transported down to the base of the convection zone "not" by the meridional flow "but" by the surface diffusion. This results in avoiding the concentration of the polar surface field. In addition, the amplification of the toroidal field occurs only at the low latitudes without the generation of the unrealistic polar toroidal field.
2009-09-02