| 20世纪地磁长期变化场分析 |
| |
| 引用本文： | 王亶文.20世纪地磁长期变化场分析[J].地球物理学报,2004,47(3):423-427. |
| |
| 作者姓名： | 王亶文 |
| |
| 作者单位： | 中国科学院空间天气开放研究实验室,北京,100080;中国地震局地球物理研究所,北京,100081 |
| |
| 基金项目： | 国家自然科学基金项目 (40 3740 56)，国家杰出青年基金项目 (4992 541 2 )，中国地震局地球物理研究所论著号 (0 4AC1 0 0 2 ) |
| |
| 摘 要： | 利用IAGA（国际地磁与高空物理学协会）编制的IGRF(国际地磁参考场)研究了20世纪地磁场变化规律. 20世纪地磁长期变化场的四极子（n=2的高斯系数所表示）变化最为显著，与主磁场相比长期变化场的球谐级数收敛较慢，利用追踪异常焦点位置随时间的变化的方法，发现地磁非偶极子长期变化场的垂直分量Z的等值图上有五大异常，其漂移情况不太统一，但是基本上是西向漂移.这种西向漂移的不一致性，在某种程度上证明了地磁场模型的正确性. 20世纪地磁场长期变化的能量谱与主磁场的不同，偶极子、 四极子和八极子的变化较明显.
|
| 关 键 词： | 地磁长期变化场 高斯系数 西向漂移 |
| 文章编号： | 0001-5733(2004)03-0423-05 |
| 修稿时间： | 2003-12-16 |
analysis of the geomagnetic secular variation in the 20th century. |
| |
| WANG Tan Wen Institute of Geophysics,China Seismological Bureau,Beijing ,China Lab. of Space Weather,Chinese Academy of Sciences,Beijing ,China.analysis of the geomagnetic secular variation in the 20th century.[J].Chinese Journal of Geophysics,2004,47(3):423-427. |
| |
| Authors: | WANG Tan Wen Institute of Geophysics China Seismological Bureau Beijing China Lab of Space Weather Chinese Academy of Sciences Beijing China |
| |
| Institution: | Institute of Geophysics, China Seismological Bureau, Beijing100081, China Lab. of Space Weather, Chinese Academy of Sciences, Beijing100080, China |
| |
| Abstract: | Using IGRF(International Geomagnetic Reference Field) workout by IAGA (International Association of Geomagnetism and Aeronomy), this paper investigates the geomagnetic field in the 20th century. The quadrupole field ( n =2) is the most significant one of the geomagnetic secular variation in the 20th century. The Gauss series of the geomagnetic secular variation is converged slower than that of the main field. Using the method of tracing the change of the position of the anomaly focus, it is found that there are 5 anomalies in the chats of Z (vertical component) of the secular variation of the non dipole field. Their drifting is not consolidate in a few degrees. But they are drifting westward basically. This inconsistency of the westward drifting of the geomagnetic secular variation proves the Wang's geomagnetic model in some degrees. Different from the geomagnetic main field, the power spectra of the dipole, quatrupole and the eighthpole field of the secular variation have significant changes. |
| |
| Keywords: | Geomagnetic secular variation Gauss coefficients Westward drifting |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
