Based on the power generation by the earth charge and the Earth rotation, and the Earth＇s magnetic energy distribution is set by the standard model of international reference field （IGRF）, the generation mechanism of the Earth＇s charge capacitor structure had been established by analysis and reasoning, and the resulting, has established a global electromagnetic field structure and equivalent circuit. The generation mechanism of electro-magnetic field is formed by biorthogonal structure of magnetic field and electric circuit, orthogonal structure of magnetic field is dipole field and non-dipole field, and orthogonal structure of electric circuit is formed by the ring current of equivalent generation with the Earth＇s charge movement and global equivalent circuit of load resistance. The dipole field has been formed by Equivalent ring current of electric charge moving. And global equivalent electric circuit composed by power supply and load resistance has formed non-dipole field. That the geomagnetic field model defined by power supply and load resistance compared with local magnetic field model is completely different, is especially the polar geomagnetic field of arch ring and the two ways boundary characteristics of geomagnetic field. This model has made reasonable explained to Aurora, Aurora ellipse area, bi-directional electrojets in polar and upgoing positive ion in polar, atmospheric electric field, formed and changes trend for the Earth natural potential, to form of interstellar magnetic field Bz, South Bs, and North BN, and relationship between Bz and magnetic storms, and relationship between earthquake and dipole field and nondipole field, etc.%由地电荷与地球自转运动发电原理及国际参考地磁场（IGRF）标准模型所确定的地球磁场能量的分布,经分析、推论,建立了地电荷的电容结构发电机制,并由此而建立了全球电磁场结构和等效电路.此电磁场发电机制由磁场和电路双正交结构组成,磁场正交结构为偶极子场和非偶极子场,电路正交结构为地电荷运动的等效发电环电流和电源及负载电阻组成的全球等效电路.电荷运动的等效发电环电流产生的是偶极子场;电源及负载电阻组成的全球等效电路产生的是非偶极子场.地电荷的电容结构发电机制所确定的地磁场结构模型,与现地磁场结构模型完全不同,特别是极区拱形地磁场及其双向地磁场边界特性.此模型对极光、极光椭圆区、极区双向电集流和极区离子上行,对大气电场、大地自然电位的形成和变化趋势,对行星际磁场BZ及其南、北分量BS和BN的生成,及行星际南向分量BS与磁暴的关系,以及对地震与偶极子场、非偶极子场之间的关系等,都作出了较合理的阐释.
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