Latitude-dependence and dispersion of the westward drift in the geomagnetic field
文献类型：期刊论文
| 作者 | Wei, ZG; Xu, WY |
| 刊名 | CHINESE SCIENCE BULLETIN
 |
| 出版日期 | 2002-02-01 |
| 卷号 | 47期号:4页码:330-333 |
| 关键词 | main geomagnetic field westward drift dispersion hydromagnetic fluid |
| ISSN号 | 1001-6538 |
| 文献子类 | Article |
| 英文摘要 | The main geomagnetic field models of IGRF1900-2000 are used to study the latitude-dependence of the westward drift in the main field. The results show that the latitude-dependence exists in the magnetic components with different wavelengths (m=1-10). The global-average westward drift rate of the component of m=1 is 0.189degrees/a with the maximum of 0.295degrees/a at latitudes 40degrees-45degrees. The component of m=2 has an average drift rate of 0.411degrees/a with the maximum of 1.305degrees/a at latitude -60degrees. As for the components with further shorter wavelengths, the drift is generally restricted in a limited latitude range, and has many smaller drift rates. This latitude-dependence of westward drift can not be explained by rigid rotation of the earth's core. The results of this note also show that there is a negative dispersion in the westward drift, namely the components of long wavelengths drift faster than those of short wavelengths. This dispersion feature is not in agreement with Hide's MHD model. It is likely needed to rind a new mechanism for explaining the observed feature of dispersion. |
| WOS关键词 | SECULAR VARIATIONS ; CORE ; IGRF |
| WOS研究方向 | Science & Technology - Other Topics |
| 语种 | 英语 |
| WOS记录号 | WOS:000175218100016 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/77567]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Wei, ZG |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wei, ZG,Xu, WY. Latitude-dependence and dispersion of the westward drift in the geomagnetic field[J]. CHINESE SCIENCE BULLETIN,2002,47(4):330-333. |
| APA | Wei, ZG,&Xu, WY.(2002).Latitude-dependence and dispersion of the westward drift in the geomagnetic field.CHINESE SCIENCE BULLETIN,47(4),330-333. |
| MLA | Wei, ZG,et al."Latitude-dependence and dispersion of the westward drift in the geomagnetic field".CHINESE SCIENCE BULLETIN 47.4(2002):330-333. |
入库方式： OAI收割
来源：地质与地球物理研究所
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