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。
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'.
出处
《地球物理学进展》
CSCD
1996年第1期104-109,共6页
Progress in Geophysics
基金
国家自然科学基金
关键词
偏心偶极子
西向漂移
漂移速率
座标系统
地磁场
Eccentric dipole, Westword drift, International geomagnetic reference field
