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非偶极子磁场西向漂移的频散特征
引用本文:魏自刚,徐文耀.非偶极子磁场西向漂移的频散特征[J].地球物理学报,2005,48(6):1276-1281.
作者姓名:魏自刚  徐文耀
作者单位:中国科学院地质与地球物理研究所,北京,100029;中国科学院地质与地球物理研究所,北京,100029
基金项目:国家自然科学基金(40204003)资助.
摘    要:根据第8代国际参考地磁场的资料,本文采用Briggs方法对1900~2000年期间m=1~10次谐波的磁位的全球平均西向漂移速度进行了计算和分析,得出了与Hide的理论预测完全不同的频散特征,即地磁场西向漂移呈现出负频散特征.本文还就Briggs方法得到的结果与采用Malin纬度剖面法的结果进行了比较和讨论,结果表明,正是由于非偶极子磁场的某些谐波分量及其漂移速度的全球分布存在着纬度依赖性,导致了两种方法计算出的个别谐波的漂移速度存在着较大的差异.

关 键 词:非偶极子磁场  国际参考地磁场  西向漂移  频散
文章编号:0001-5733(2005)06-1276-06
收稿时间:2004-12-02
修稿时间:2004-12-022005-08-12

Dispersion of the westward drift rate in the non-dipole geomagnetic field
WEI Zi-Gang,XU Wen-Yao.Dispersion of the westward drift rate in the non-dipole geomagnetic field[J].Chinese Journal of Geophysics,2005,48(6):1276-1281.
Authors:WEI Zi-Gang  XU Wen-Yao
Institution:Institute of Geophysics and Geology, Chinese Academy of Sciences, Beijing 100029, China
Abstract:Based on the 8th generation of International Geomagnetic Reference Field, the global average westward drift rates of geomagnetic potential harmonic W1~W10 during 1900~2000 are studied by using the Briggs' method. The results show that the westward drift rate decreases with the increasing harmonic order m, that doesn't agree with the Hide's theoretical prediction. Two different analysis methods as used by Malin and Briggs respectively are discussed. It is suggested that the latitudinal dependence of the nondipole field drift could be different results by using different analysis methods.
Keywords:Non-dipole geomagnetic field  International Geomagnetic Reference Field  Westward drift  Depression
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