非偶极子磁场

1690年以来全球非偶极子磁场的变化特征

Global Changes of the Non-Dipole Magnetic Field Since 1690

结果表明，地磁偶极子磁矩变化率、功率谱变化率以及非偶极子磁场各阶球谐系数的平均漂移速率均存在60a左右的周期。

The results indicate that there is a periodicity about 60 years for the change rates of geomagnetic parameters , including geomagnetic moment , the spatial power spectrum and the average drift rate of spherical harmonic coefficients with different orders of the non-dipole magnetic field .

在修正了Briggs提出的移动变形图案相关分析法基础上，对全球非偶极子磁场以及6个行星尺度磁异常区的漂移特性和强度变化进行了研究。

In this paper we modified the Briggs ' method of correlation analysis of moving random pattern and studied the characteristics of the westward drift and intensity variations of the non dipole geomagnetic field and 6 planetary scale geomagnetic anomalies .

非偶极子磁场西向漂移的频散特征

Dispersion of the westward drift rate in the non-dipole geomagnetic field

结果表明，在1900&2000年期间，全球非偶极子磁场以015°/a的平均速度向西漂移，强度累计增长了29%；

During 1900 & 2000 , the non dipole field has drifted westward at an average speed of 0 15 ° / a , and has intensified by 29 % . Six planetary scale magnetic anomalies exhibit different characteristics in the drift .