【摘要】 本文根据国际地磁参考场模型ＤＧＲＦ１９４５－１９８５、ＩＧＲＦ１９９０和ＳＶ１９９０－１９９５。计算近期偏心偶极位置和漂移速度。并对西向漂移速度进行了分析。结果表明，１９７０年以前，漂移速度是连续下降，到１９７０最低值，以后，又呈上升趋势。这一现象与地磁长期变化加速度的突然变化即＂Ｊｅｒｋ＂有很好的相关性。更多还原

【Abstract】 In this paper, the positions of eccentric dipole and its drift rate were calculated using International Geomagnetic Reference Field models. DGRF 1945-1985. IGRF 1990 and SC1990. The westward drift rate was analysed. Results show that the drift rate continuously decreased from 1943 to 1970, and there was minimum at 1970, and followed a subsequent increase. The phenomenon well correlated with geomagnetic secular variation acceleration which was called "Jerk".更多还原