地球核内の流体運動と磁場(<小特集>地球惑星システム)

概要

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We introduce two approaches to understanding of a geodynamo mechanism. One corresponds to a forward problem, where time evolution of the velocity, the temperature, and the magnetic fields is numerically computed for a model of thermally driven MHD dynamo in a rotating spherical shell. The other corresponds to an inverse problem, where core surface flows are estimated, on the basis of the frozen-flux approximation, or both the velocity and the magnetic fields within the core are estimated, from the observed Earth's magnetic field. In the former approach, essential nature of complex dynamo processes is clarified in a physically simple model. In the latter approach, some constraints on a realistic dynamo are derived from a geophysical viewpoint. Combination of these approaches will advance the study of geodynamo.
日本シミュレーション学会の論文
1995-12-15