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本文从高斯位理论出发,得到了包含内源场和外源场的局部地区地磁场矩谐级数表达式,指出了局部地区地磁场内、外源部分分离的可能性。对中国及邻近地区1970.0年地磁场的矩谐分析结果表明:在北纬10°—45°之间有一个垂直分量的负异常带,异常中心在西藏高原和太平洋西部,最大异常值分别达到-330γ和-460γ;北向分量的正异常区从北纬23°一直伸展到北纬55°以北,极大值约在北纬40°附近,极值达300γ;东向分量在整个区域呈现微弱的正异常。本文对与矩谐分析有关的截断水平、光滑处理以及误差分析等问题也进行了讨论。
In this paper, based on the Gaussian bit theory, we obtain the expression of harmonic series of local magnetic field in local area, including the endogenous field and the exogenous field, and point out the possibility of the separation of the internal and external geomagnetic field in the local area. The results of the moment harmonic analysis of the geomagnetic field in China and its neighboring regions in 1970. 0 years show that there is a negative anomalous zone with a vertical component between 10 ° -45 ° North latitude and the anomalous center is located in the Tibetan Plateau and the western part of the Pacific Ocean. And -460γ. The positive anomaly of the northward component extends from 23 ° north latitude to 55 ° north latitude. The maximum value is about 40 ° north latitude and the extreme value reaches 300γ. The eastward component shows a weak positive anomaly over the entire region. This paper also discusses the issues of the level of truncation, smoothing and error analysis related to moment harmonic analysis.