Japan Geoscience Union Meeting 2016

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Poster

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS10] Geophysical fluid dynamics-Transfield approach to geoscience

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Keita Iga(Atmosphere and Ocean Research Institute, The University of Tokyo), Kensuke Nakajima(Department of Earth and Planetary Sciences,Flculty of Sciences,Kyushu University), Shigeo Yoshida(Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University), Takatoshi Yanagisawa(Department of Deep Earth Structure and Dynamics Research, Japan Agency for Marine-Earth Science and Technology), Hidenori Aiki(Japan Agency for Marine-Earth Science and Technology)

5:15 PM - 6:30 PM

[MIS10-P06] Spherical MHD dynamo in a thin convection layer above a thick resistive core

*Akira Kageyama1, Takuya Furuzono1 (1.Graduate School of System Informatics, Kobe University)

Keywords:MHD dynamo, spherical convection, Yin-Yang-Zhong grid

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.