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一般通过在国界外围均匀添加一定数量的IGRF点以改善区域地磁场模型的边界效应.而最新的地磁场综合模型(Comprehensive Model 4,CM4)可以计算1960～2002年内全球任意区域的地核场、地壳场、磁层场及其感应场、电离层场及其感应场,其内源场比IGRF更适合作为边界补充点以提高模型精度.本文对CM4和IGRF10的地核场网格图进行了比较,并以Taylor多项式模型为例,通过将34个CM4的内源场数据点和34个IGRF10的数值点分别作为边界补充点代入计算出网格值,并将其相减以分析差异.结果显示:各分量在国内大部分区域差异很小,几乎都为0值,在境外区域除了北向分量(X),其余分量均是正值,说明结合IGRF10建立的模型在国界外区域的数值偏小.
The boundary effect of regional geomagnetic field model is generally improved by adding a certain number of IGRF points evenly around the periphery of the boundary.While the latest Comprehensive Model 4 (CM4) can calculate the nuclear field in any region in the world from 1960 to 2002, The crustal field, magnetosphere and its induced, ionospheric and induced fields are more suitable than the IGRF as complementary points in the boundary to improve the accuracy of the model.In this paper, the nuclear field grids of CM4 and IGRF10 In the Taylor polynomial model, the grid values of 34 CM4 endogenous field data points and 34 IGRF10 numerical values were substituted respectively into the boundary points to calculate the grid values, and subtracted to analyze the differences. The results show that the components are very small in most regions of China, almost all of them are 0, and all the other components are positive except for the north component (X) in the overseas regions, indicating that the numerical value of the model established by combining IGRF10 with the outside of the border is small .