欧洲及其邻区MAGSAT卫星磁异常冠谐模型

通过对欧洲及其邻近地区 MAGSAT 卫星黎明资料进行了处理,得到1°×1°卫星磁异常网格值。本文使用冠谐分析方法,计算该地区卫星矢量磁异常（ΔX,ΔY,ΔZ）冠谐模型。球冠极点位于33°N和26°E,球冠半角为40°.冠谐模型的截断指数为18。根据卫星磁异常冠谐模型和地磁场球谐模型 DGRF1980,计算卫星总强度磁异常（ΔF）的冠谐一球谐模型。根据卫星磁异常的理论模型,计算并绘制不同高度（300,400,500km）的理论卫星磁异常图。对冠谐模型和大磁异常进行了分析和讨论。

SPHERICAL CAP HARMONIC MODELS OF MAGSAT MAGNETIC ANOMALIES OVER EUROPE AND ITS ADJACENT REGION

In order to extract MAGSAT magnetic anomalies,we use the dawn data set （6^h LT） only,while the main geomagnetic field,magnetospheric,ionospheric and induction fields were deleted.The region studied is divided into 1^°×1° cells,and the gridded values were produced.According to the 1°×1° gridded values,using the method of spherical cap harmonic analysis,a spherical cap harmonic model of MAGSAT magnetic anomalies has been derived.The pole of the cap is at 33°N and 26° E,its half-angle is 40°,the truncation index Kmax is 18,the total of the model coefficients is 361.Based on the spherical cap harmonic model of MAGSAT magnetic anomalies （△X,△Y,△Z） and the spherical harmonic model of the geomagnetic field （DGRF1980）,a spherical cap harmonic-spherical harmonic model of MAGSAT total intensity magnetic anomalies（△F） has been derived,too.According to the theoretical models of MAGSAT magnetic anomalies,the theoretical magnetic anomaly maps for △X,△Y,△Z and △F at different altitudes（300,400,500km） are presented,they can describe the three-dimensional structure of MAGSAT magnetic anomalies over Europe and its adjacent region.