Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2026080118 |
Equatorial auroral records reveal dynamics of the paleo-West Pacific geomagnetic anomaly | |
Fei He; Yong Wei; Stefano Maffei; Philip W. Livermore; Christopher J. Davies; Jon Mound; Kaihua Xu; Shuhui Cai; Rixiang Zhu | |
2021-05-18 | |
发表期刊 | Proceedings of the National Academy of Science
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出版年 | 2021 |
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 form of red aurora–like airglow visible to the naked eye. Smoothed global geomagnetic models predict a low-intensity 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. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/326773 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Fei He,Yong Wei,Stefano Maffei,et al. Equatorial auroral records reveal dynamics of the paleo-West Pacific geomagnetic anomaly[J]. Proceedings of the National Academy of Science,2021. |
APA | Fei He.,Yong Wei.,Stefano Maffei.,Philip W. Livermore.,Christopher J. Davies.,...&Rixiang Zhu.(2021).Equatorial auroral records reveal dynamics of the paleo-West Pacific geomagnetic anomaly.Proceedings of the National Academy of Science. |
MLA | Fei He,et al."Equatorial auroral records reveal dynamics of the paleo-West Pacific geomagnetic anomaly".Proceedings of the National Academy of Science (2021). |
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