Coupled magnetohydrodynamic oscillations in the magnetsphere-iono-sphere system -Hall current effect-

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概要

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• As the first step to a quantitative study of the magnetohydrodynamic coupled oscillations for the magnetosphere-ionosphere system, we revise the basic equations into a suitable form for computer calculations by means of the finite element method. Numerical analysis is performed by using a simple box model, taking account of the anisotropically conducting ionosphere and the insulating atmosphere. Owing to limited capacity of a computer, the effect of the ionospheric Hall current is discussed. We obtained the following results : (1) The mode conversion effect due to the Hall current gives rise to resonant coupling when the azimuthal wave number is zero (the azimuthal direction is referred to the direction perpendicular to the plane of the box model). (2) The Alfven mode perturbation is enhanced along the resonant field line but in the case of the fast magnetosonic mode the enhancement does not occur.

• 国立極地研究所の論文

著者

• Fujita Shigeru

  Meteorological College

関連論文

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• Coupled magnetohydrodynamic oscillations in the magnetsphere-iono-sphere system -Hall current effect-
• A wave equation describing the generation of field-aligned current in the magnetosphere.

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