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《Chinese Journal of Geophysics》 2005-01
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Selection of the geomagnetic normal field and calculation of the geomagnetic anomalous field

GAO Jin-Tian1, AN Zhen-Chang 1,2, GU Zuo-Wen1, HAN Wei1, ZHAN Zhi-Jia1, YAO Tong-Qi1 1 Institute of Geophysics, China Earthquake Administration, Beijing 100081, China 2 Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029, China  
According to the geomagnetic observational data in China for 2003, including 135 geomagnetic stations and 35 geomagnetic observatories, and the geomagnetic data of 38 IGRF calculated points in China's adjacent regions, the distribution of the geomagnetic anomalous field in China was calculated. The two kinds of geomagnetic models are selected as the geomagnetic normal field: one is the spherical harmonic model of the international geomagnetic reference field, and the other is the Taylor polynomial model of the geomagnetic field in China. Based on the geomagnetic anomaly values (the observed value minus the calculated value of the model) at various stations, the spherical cap harmonic model of the geomagnetic anomalous field was calculated by using the spherical cap harmonic analysis method. The geomagnetic anomaly charts(ΔD, ΔI, ΔF, ΔX, ΔY and ΔZ)in China for 2003 are drawn.The geomagnetic anomalous field in China is analyzed and discussed.
【Fund】: 中国科技部社会公益性专项重点项目 (M0 10 72 6A)资助
【CateGory Index】: P318
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