Dynamics and anisotropy of the Earths inner core : Importance of the magnetic coupling with the outer core

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概要

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• Macroscopic processes which may be responsible for the anisotropic structure in the Earths inner core are examined. It is concluded that the magnetic interaction with the outer core plays the most important role in the dynamics of the inner core. Deformation due to the magnetic interaction causes cumulative strain at least for a period of one magnetic polarity (-0.1-10my), and can result in a large strain (-1-103) leading to the formation of anisotropic structures. The flow caused by the magnetic field results in continuing melting and solidification at the inner-outer core boundary which gives rise to a large energy release (or absorption). The present model shows that the pattern of energy release (or absorption) due to this mechanism is consistent with that of dynamo models, indicating that the energy release (or absorption) caused by this mechanism enhances convection in the outer core and hence stabilizes the magnetic field which is otherwise highly unstable.

• 日本学士院の論文

著者

• KARATO Shun-ichiro

  University of Minnesota, Department of Geology and Geophysics

関連論文

• Dynamics and anisotropy of the Earths inner core : Importance of the magnetic coupling with the outer core

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