[M-IS10] 地球流体力学：地球惑星現象への分野横断的アプローチ

[MIS10-P06] 薄い対流層のMHDダイナモ

*陰山 聡¹、古薗 拓也¹ (1.神戸大学大学院システム情報学研究科)

キーワード：MHDダイナモ、球対流、イン=ヤン=ゾン格子

We performed magnetohydrodynamics (MHD) simulations in a sphere of radius r=1 with a thin convection layer between r=0.9 and r=1, with relatively slow rotation rates. The inner sphere of radius r=0.9 is a stable (rigid) region with the same resistivity as the convection layer. The dynamo-generated magnetic field, therefore, diffuses into the inner resistive sphere. Since the convection layer is such thin, the convection pattern and its dynamo action are very different from those observed in the standard geo- or solar dynamo simulations. For these simulations, we applied a newly developed global grid, Yin-Yang-Zhong grid [Hayashi & Kageyama, JCP (2016)] by which we can solve equations on the coordinate singularity at r=0.