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Regional spatiotemporal variations of a nondipole magnetic field over the Chinese mainland and neighboring regions in millennial scale
Feng, Yan; Jiang, Yong; 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.
Department空间科学部
Source PublicationAPPLIED GEOPHYSICS
2017
Volume14Issue:2Pages:314-321
ISSN1672-7975
Language英语
KeywordGeomagnetic Field Nondipole Cals10k.1b Igrf11
AbstractSpatiotemporal 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.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/6011
Collection空间科学部
Corresponding AuthorFeng, 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.
Recommended Citation
GB/T 7714
Feng, Yan,Jiang, Yong,Feng, Y ,et al. Regional spatiotemporal variations of a nondipole magnetic field over the Chinese mainland and neighboring regions in millennial scale[J]. APPLIED GEOPHYSICS,2017,14(2):314-321.
APA Feng, Yan,Jiang, Yong,Feng, Y ,&Feng, Y .(2017).Regional spatiotemporal variations of a nondipole magnetic field over the Chinese mainland and neighboring regions in millennial scale.APPLIED GEOPHYSICS,14(2),314-321.
MLA Feng, Yan,et al."Regional spatiotemporal variations of a nondipole magnetic field over the Chinese mainland and neighboring regions in millennial scale".APPLIED GEOPHYSICS 14.2(2017):314-321.
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