| 地磁场长期变化特征及机理分析 |
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| 引用本文： | 郭凤霞,张义军,言穆弘.地磁场长期变化特征及机理分析[J].地球物理学报,2007,50(6):1649-1657. |
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| 作者姓名： | 郭凤霞 张义军 言穆弘 |
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| 作者单位： | 1.中国科学院寒区旱区环境与工程研究所，兰州 730000;2.中国气象科学研究院，北京 100081 |
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| 基金项目： | 国家自然科学基金项目(40605002,40575002)资助 |
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| 摘 要： | 将地磁场的总变化分为三部分：偶极场自身变化，非偶极场自身变化及非偶极场磁斑区通过对核幔边界（CMB）层环形电流的调制来影响偶极场的变化. 本文利用国际地磁参考场模型IGRF）1900～2000计算分析了地球不同深度地磁场分布及长期变化特征，且讨论了变化的可能机制. 可以推论，地磁场西漂和倒转不仅是非偶极场引起，同时与偶极场有密切关系.
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| 关 键 词： | 地磁场 地磁极 偶极矩 等效电流 长期变化 |
| 文章编号： | 0001-573312007）06-1649-09 |
| 收稿时间： | 2007-1-12 |
| 修稿时间： | 2007-01-12 |
The secular variation characteristics and mechanisms of geomagnetic field |
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| GUO Feng-Xia,ZHANG Yi-Jun,YAN Mu-Hong.The secular variation characteristics and mechanisms of geomagnetic field[J].Chinese Journal of Geophysics,2007,50(6):1649-1657. |
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| Authors: | GUO Feng-Xia ZHANG Yi-Jun YAN Mu-Hong |
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| Institution: | 1.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;2.Chinese Academy of Meteorological Sciences, Beijing 100081, China |
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| Abstract: | The variations of geomagnetic field are divided into three parts, the spontaneous variations of dipole and non-dipole geomagnetic fields, and the dipole geomagnetic field variation resulting from geomagnetic anomaly areas of non-dipole field through modulating the ring current in CMB. The secular variation characteristics and distributions of geomagnetic field at different depths are calculated and analysed in this paper by using the model of nternational Geomagnetic Reference Field (1900～2000). Possible mechanisms are discussed. It can be concluded that the westward drift and reverse of geomagnetic field are not only resulted from non-dipole field, but also dipole. |
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| Keywords: | Geomagnetic field Geomagnetic pole Dipole moment Equivalent current Secular variation |
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