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《Chinese Journal of Geophysics》 2003-01
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SPHERICAL CAP HARMONIC ANALYSIS OF THE GEOMAGNETIC FIELD AND ITS SECULAR VARIATION IN CHINA FOR 2000

AN ZHENCHANG Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101,China  
According to the three component absolute survey data of 118 geomagnetic stations observed during 1998~2000 and 39 geomagnetic observatories and IGRF 2000, the spherical cap harmonic models of the geomagnetic field for 2000(the truncation order is 8), and the geomagnetic secular variation for 2000~2005(the truncation oder is 6) are calculated. The pole of the spherical cap is at 36°N and 104°E, and its half-angle is 30°. The spherical cap harmonic models of the geomagnetic field and its secular variation can better express the spatial-temporal variation of the geomagnetic field in China. The root mean square(RMS) deviations of the geomagnetic model are 104.4 nT for X, 103.3 nT for Y and 123.9 nT for Z. Based on the spherical cap harmonic models of the geomagnetic field and its secular variation, the geomagnetic charts(F,X,Y,Z),the anomaly charts(ΔF,ΔX,ΔY,ΔZ) for 2000 and the secular variation charts(AF·U,AX·U,AY·U,AZ·U) for 2000~2005 are drawn. The ways of improving the boundary effect of the geomagnetic model and arranging the repeat stations are suggested.
【Fund】: 国家自然科学基金重点项目 (497341 4 0 ) .
【CateGory Index】: P318
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