三维非均匀地幔中深源电场和磁场的谱理论(Ⅱ)——横向缓变摄动和极型场快速扩散 |
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引用本文: | 马石庄.三维非均匀地幔中深源电场和磁场的谱理论(Ⅱ)——横向缓变摄动和极型场快速扩散[J].地球物理学报,1999(3). |
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作者姓名: | 马石庄 |
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作者单位: | 中国科学院地球物理研究所!北京,100101 |
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基金项目: | 国家杰出青年自然科学基金!49454006 |
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摘 要: | It is one of the classical problems
in Earth′s electromagnetism that continuation of the observatory data of magnetic field
into the conducting region. This paper built the coupling vector equations governing the
poloidal, toroidal and potential fields in 3-D inhomogeneous conducting mantle.
Considering the limitation on variable scale of inhomogeneities in global mantle from
study of the Earth′s deep interior, a perturbation theory of gradually lateral
variation was presented. It is unnecessary that the 1-D spherical symmetric distribution
of electric conductivity as zero-degree approximation. Serving as a example of solvability
of the zero-degree approximation, it was demonstrated how the gradually lateral variation
of electric conductivity effect on anti-diffusive problem of poloidal field in Earth′s
mantel.
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关 键 词: | 导电地慢 横向不均匀 电磁场 |
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