球殻熱対流における磁場成長の数値解析

抄録

The purpose of this study is to elucidate the fundamentals of geomagnetism creation of the Earth. For this, we assume a simplified model for numerical computations. The present study considers the interaction between the magnetic field and thermal convection for an incompressible viscous fluid in a rotating spherical shell. For certain combination of parameters, ideal convection structure, which rotates at a constant speed with keeping the fluid and temperature fields, is attained and it may generate magnetic field which grows exponetially during the early stage and finally tends to reach to quasi constant value. It is exhinited that the growth rate of the magnetic field depends on the magnetic Prandtl number.