Inversion of the Sq current system and the geomagnetic diurnal variation model
Inversion of the Sq current system and the geomagnetic diurnal variation model
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发表时间：
2010
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通讯作者：
Zhao Xu-dong;DU Ai-mm;Chen Hua-ran;Cheng Hong-fei
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文献类型：
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作者：
Zhao Xu-dong;DU Ai-mm;Chen Hua-ran;Cheng Hong-fei
地磁场的标量势满足拉普拉斯方程。拉普拉斯方程可以用球坐标下的球谐波级数的和来表示。利用球谐分析的方法，将地磁场分为内源场和外源场。本文主要研究：(1)1997年用于Sq空间等效电流系统反演的Sq电流反演的球谐分析方法。我们集中讨论了Sq相位和大小的季节变化。(2)利用1997年的地磁观测资料，建立了中国地区地磁日变化模型，该模型考虑了地磁随纬度和声发射指数的变化。同时，对模型和观测结果进行了比较。
The scalar potential of the geomagnetic field satisfies the Laplace equation.The Laplace equation can be represented by the sum of spherical harmonics series in the spherical coordinates.By using the method of spherical harmonics analysis,the geomagnetic field can be divided into the inner source field and the outer source field.This paper mainly focuses on:(1) The spherical harmonics analysis method for the Sq current inversion that is used to inverse the Sq space equivalent current system in 1997.We intensively discuss the seasonal variations of Sq phase and magnitude.(2) We establish a geomagnetic diurnal model based on the observational geomagnetic field data in 1997, in which the geomagnetic field varies with latitude and AE index in China.Also,we compare the results from the model and the observations.