气候变化领域集成服务门户(CCPortal): Equatorial auroral records reveal dynamics of the paleo-West Pacific geomagnetic anomaly

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DOI	10.1073/pnas.2026080118
	Equatorial auroral records reveal dynamics of the paleo-West Pacific geomagnetic anomaly
	He F.; Wei Y.; Maffei S.; Livermore P.W.; Davies C.J.; Mound J.; Xu K.; Cai S.; Zhu R.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:20
英文摘要	Localized regions of low geomagnetic intensity such as the South Atlantic Anomaly allow energetic particles from the Van Allen radiation belt to precipitate into the atmosphere and have been linked to a signature in the formof red aurora-like airglow visible to the naked eye. Smoothed global geomagnetic models predict a lowintensity West Pacific Anomaly (WPA) during the sixteenth to nineteenth centuries characterized by a simple time dependence. Here, we link the WPA to an independent database of equatorial aurorae recorded in Seoul, South Korea. These records show a complex fluctuating behavior in auroral frequency, whose overall trend from 1500 to 1800 AD is consistent with the locally weak geomagnetic field of the WPA, with a minimum at 1650 AD. We propose that the fluctuations in auroral frequency are caused by corresponding and hitherto unknown fluctuations in the regional magnetic intensity with peaks at 1590 and 1720 AD, a time dependence that has been masked by the smoothing inherent in regularized global geomagnetic models. A physical core flow model demonstrates that such behavior requires localized time-dependent upwelling flows in the Earth's core, possibly driven by regional lower-mantle anomalies. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Ancient aurora; Core dynamics; Geomagnetic anomaly; Geomagnetic secular variation
语种	英语
scopus关键词	article; physical model; South Korea
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238736
作者单位	Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China; School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
推荐引用方式 GB/T 7714	He F.,Wei Y.,Maffei S.,et al. Equatorial auroral records reveal dynamics of the paleo-West Pacific geomagnetic anomaly[J],2021,118(20).
APA	He F..,Wei Y..,Maffei S..,Livermore P.W..,Davies C.J..,...&Zhu R..(2021).Equatorial auroral records reveal dynamics of the paleo-West Pacific geomagnetic anomaly.Proceedings of the National Academy of Sciences of the United States of America,118(20).
MLA	He F.,et al."Equatorial auroral records reveal dynamics of the paleo-West Pacific geomagnetic anomaly".Proceedings of the National Academy of Sciences of the United States of America 118.20(2021).