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题名: Regional spatiotemporal variations of a nondipole magnetic field over the Chinese mainland and neighboring regions in millennial scale
作者: Feng, Yan; Jiang, Yong
作者部门: 空间科学部
通讯作者: Feng, Y (reprint author), Nanjing Univ Informat Sci Technol, Coll Math & Stat, Nanjing 210044, Jiangsu, Peoples R China. ; Feng, Y (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Beijing 100080, Peoples R China.
关键词: geomagnetic field ; nondipole ; CALS10K.1b ; IGRF11
刊名: APPLIED GEOPHYSICS
ISSN号: 1672-7975
出版日期: 2017
卷号: 14, 期号:2, 页码:314-321
收录类别: SCI
项目资助者: State Key Laboratory of Space Weather, Chinese Academy of Sciences ; Jiangsu Government Scholarship for Overseas Studies
英文摘要: Spatiotemporal variations of the nondipole (ND) magnetic field over the Chinese mainland and neighboring regions from 10000 BC to 1990 AD were analyzed using the latest global geomagnetic models CALS10K.1b, CALS3K.4, and IGRF11. Moreover, for field sources, we investigated 2 (n) (n = 2-10) pole ND fields and their energies. The results suggest that the study period can be divided into three. The intensity of the ND field has been mainly positive since 10000 BC and lasted almost 7500 years, then gradually decreased to negative in 2500 BC to 1500 AD, and finally sharply increased to positive. The anomaly areas of the ND field in East Asia took shape for n = 3, when the anomaly areas in East Asia were shaped into closed circles in the mainland. This suggests that the first three harmonic degrees account for most of the ND field. The energy of the ND field rapidly attenuates at the core-mantle boundary and is stable at the surface.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6011
Appears in Collections:空间科学部_期刊论文

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