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《Chinese Journal of Geophysics》 1995-02
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LEGENDRE POLYNOMIAL MODELS OF THE GEOMAGNETIC FIELD OVER THE EASTERN ASIA AT EPOCH 1980.0

AN ZHBN-CHANG; TAN DONG-HAI(Institute of Geophysics,Academia Sinica ,Beijing 100101)V.P.GOLOVKOV;N.M.ROTANOVA;T.N.BONDAR (IZMIRAN of,the. Russian Academy of Sciences,Moscow,Russia)  
Based on the geomagnetic repeat station data and the geomagnetic observatoryannual mean values,including 98 repeat stations in China,and 100 repeat stations in the USSR and 39 geomgnetic observatories in the Eastern Asia, the geomagnetic field models were derived by using the Legendre polynomial method. The rootmean square deviations are 144.6nT for total intensity,19.1′for declination and 8.5′for inclination.The geomagnetic charts over the Eastern Asia at epoch 1980.0were drawn.The comparisons between the Legendre polynomial models and DGRF1980 model were done. The fitting effects of the Legendre polynomial models aresatisfactory. The main results of the present work are following: 1.The methodis presented for the representing the geomagnetic field distribution on the limitedregions based on the expanding the geomagnetic field in the Legendre polynomial.2. The all geomagnetic data in China and the USSR for 1980.0 were gathered andanalysed. 3.It is derived the 7-order Legendre polynomial models of the geomagnetic field over the Eastern Asia at epoch 1980.0.
【Fund】： 国家自然科学基金
【CateGory Index】： P318.1
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