Formation of current coils in geodynamo simulations

Akira Kageyama (), Takehiro Miyagoshi and Tetsuya Sato
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Akira Kageyama: Earth Simulator Center, Japan Agency for Marine-Earth Science and Technology, Yokohama, 236-0001, Japan
Takehiro Miyagoshi: Earth Simulator Center, Japan Agency for Marine-Earth Science and Technology, Yokohama, 236-0001, Japan
Tetsuya Sato: Earth Simulator Center, Japan Agency for Marine-Earth Science and Technology, Yokohama, 236-0001, Japan

Nature, 2008, vol. 454, issue 7208, 1106-1109

Abstract: Earth's geodynamo modelled Earth's magnetic field is generated by electric current flowing in the planetary core. Computer simulations have played an important role in improving our understanding of this geodynamo, but its numerical simulation within the parameter regime directly relevant to the Earth's core is beyond the power of today's supercomputers. Now the Earth Simulator, one of the fastest computers in the world, has been used to run a geodynamo simulation that is the nearest yet to the real thing. In the simulation both the convective flow and magnetic field structures are qualitatively different from those found in lower-resolution simulations, with convection taking the form of sheet plumes or radial sheet jets, rather than columnar cell structures, as previously observed.

Date: 2008
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DOI: 10.1038/nature07227

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