【摘要】 本文根据最新修正的第七代国际地磁参考场模型， 计算了中心偶极矩， 中心偶极位置参量； 计算了偏心偶极位置及其参量． 给出了近四个世纪中心偶极和偏心偶极的变化图象． 发现了偏心偶极漂移速率在１９７０ 年代出现地磁“ｊｅｒｋ”， 这些结果是很有科学价值的．更多还原

【Abstract】 In this paper,The centric dipole moment position paramenter of centric dipole and positian of eccentric and its drift rate were calculated using International Geomagnetic Reference Field models-seventh generation at 1900 to 2000 years. The change picture of the centric and eccentric dopoles in the last 100 years has given. The drift rate of eccentric dipole occured maximum value at the 1970 year. The results indicated that the “jerk” of the geomagnetic field secular variatian. These results were with grest science worth.更多还原