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Science 15 July 2005:
Vol. 309. no. 5733, pp. 459 - 461
DOI: 10.1126/science.1111831
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Reports

Simulations of a Quasi–Taylor State Geomagnetic Field Including Polarity Reversals on the Earth Simulator

Futoshi Takahashi,1* Masaki Matsushima,2 Yoshimori Honkura2

High-resolution, low-viscosity geodynamo simulations have been carried out on the Earth Simulator, one of the fastest supercomputers, in a dynamic regime similar to that of Earth's core, that is, in a quasi–Taylor state. Our dynamo models exhibit features of the geodynamo not only in spatial and temporal characteristics but also in dynamics. Polarity reversals occurred when magnetic flux patches at high latitudes moved poleward and disappeared; patches with reversed field at low and mid-latitudes then moved poleward.

1 Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa, Japan.
2 Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, Japan.

* To whom correspondence should be addressed. E-mail: futoshi{at}stp.isas.jaxa.jp

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Science. ISSN 0036-8075 (print), 1095-9203 (online)