Effect of high-degree harmonics in the IGRF models on secular variation of the geomagnetic field
文献类型：期刊论文
| 作者 | Xu, WY |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2003-07-01 |
| 卷号 | 46期号:4页码:476-481 |
| 关键词 | main geomagnetic field International Geomagnetic Reference Field (lGRF) secular variation spherical harmonic coefficients |
| ISSN号 | 0001-5733 |
| 英文摘要 | The contribution to the main geomagnetic field from high-degree harmonics of IGRF models is usually neglected, since the high-degree Gauss coefficients in IGRF models are much less than low-degree ones. However, the high-degree harmonics have significant contribution to secular variations of the magnetic field. The effects of the unusual behaviors in high-degree Gauss coefficients of IGRF 1945 similar to 1955 on the secular variation are studied by using the eighth generation of IGRF. By comparing the original and the revised IGRF models,the errors in the high-degree coefficients are estimated and corrected. Since the magnitudes of high-degree terms increase rapidly with increasing depth, these errors will distort greatly the magnetic field configuration and magnetic energy distribution in the deep interior. The important effects are also detected in the calculation of the liquid flow pattern at the outer core surface and in the geomagnetic estimation of the core radius. |
| 语种 | 英语 |
| WOS记录号 | WOS:000184512900008 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/79053]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Xu, WY |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, WY. Effect of high-degree harmonics in the IGRF models on secular variation of the geomagnetic field[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2003,46(4):476-481. |
| APA | Xu, WY.(2003).Effect of high-degree harmonics in the IGRF models on secular variation of the geomagnetic field.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,46(4),476-481. |
| MLA | Xu, WY."Effect of high-degree harmonics in the IGRF models on secular variation of the geomagnetic field".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 46.4(2003):476-481. |
入库方式： OAI收割
来源：地质与地球物理研究所
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