Thirty-year period in secular variation rate of the main geomagnetic field
文献类型：期刊论文
| 作者 | Xu Wen-Yao; Nataf, Henri-Claud; Wei Zi-Gang; Du Ai-Min |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2006-09-01 |
| 卷号 | 49期号:5页码:1329-1338 |
| 关键词 | Main Geomagnetic Field Secular Variation Dipole Field Non-dipole Field Unsigned Annual Rate |
| ISSN号 | 0001-5733 |
| 文献子类 | Article |
| 英文摘要 | The main geomagnetic field, B, and its secular variation, B, originate from same dynamo process in the outer core. Their spatial structure and temporal behaviors, however, are drastically different. Using globally averaged unsigned annual rate' (X) over bar,(Y) over bar,(Z) over bar,(H) over bar and (F) over bar, to express the magnitude of the B-field, we studied periodicity in the B-field on the basis of IGRF-9 models. The results show that the B-field experienced a three-episode variation during the centennial period from 1900 to 2000. The maximum annual rates occurred around 1910 similar to 1920, 1940 similar to 1950, and 1970 similar to 1980, respectively, showing a 30-year period. In addition, the rising phase in each episode is much shorter than declining phase. The governing factor of this periodic variation is the non-dipole field, mainly the quatrupole, instead of the dipole field, although the dipole field is dominative over all other multiples in the main field B. |
| WOS关键词 | WESTWARD DRIFT ; MAGNETIC OBSERVATIONS ; CORE ; JERKS ; INTENSITY ; EARTH |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000240860700012 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/65890]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Xu Wen-Yao |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Lab Geophys Interne & Tectonophys, Grenoble, France |
| 推荐引用方式 GB/T 7714 | Xu Wen-Yao,Nataf, Henri-Claud,Wei Zi-Gang,et al. Thirty-year period in secular variation rate of the main geomagnetic field[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2006,49(5):1329-1338. |
| APA | Xu Wen-Yao,Nataf, Henri-Claud,Wei Zi-Gang,&Du Ai-Min.(2006).Thirty-year period in secular variation rate of the main geomagnetic field.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,49(5),1329-1338. |
| MLA | Xu Wen-Yao,et al."Thirty-year period in secular variation rate of the main geomagnetic field".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 49.5(2006):1329-1338. |
入库方式： OAI收割
来源：地质与地球物理研究所
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