DOI: 10.1002/2016GL071526
论文题名: The interplanetary and magnetospheric causes of extreme dB/dt at equatorial locations
作者: Adebesin B.O. ; Pulkkinen A. ; Ngwira C.M.
刊名: Geophysical Research Letters
ISSN: 0094-8377
EISSN: 1944-8108
出版年: 2016
卷: 43, 期: 22 起始页码: 11501
结束页码: 11509
语种: 英语
英文关键词: equatorial electrojet
; extreme events
; geomagnetic variations
; geomagnetically induced currents
; magnetosphere-ionosphere coupling
Scopus关键词: Atmospheric electricity
; Electric fields
; Geomagnetism
; Ionosphere
; Solar wind
; Equatorial electrojet
; Extreme events
; Geomagnetic variation
; Geomagnetically induced currents
; Magnetosphere-ionosphere coupling
; Magnetosphere
英文摘要: The 1 min resolution solar wind and geomagnetic data obtained from seven equatorial/low-latitude stations during four extreme geomagnetic activities are used to investigate the extreme dB/dt perturbations. Simulations of the magnetospheric-ionospheric environment were also performed for varying amplitudes of the solar proton density. Simulations were carried out using the Space Weather Modeling Framework/BATS-R-US + RCM model. Both the observations and simulations demonstrated that the appearance time of the extreme dB/dt perturbations at equatorial stations during disturbed conditions is instantaneous and equitable to those experienced at auroral regions yielding time lags of the order of a few seconds. We find that the rapid dB/dt enhancements are caused by the electric field of magnetospheric current origin, which is being enhanced by solar wind density and ram pressure variations and boosted by the equatorial electrojet. Our results indicate that the solar wind proton density variations could be used as a predictor of extreme dB/dt enhancement at equatorial latitudes. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85004008228&doi=10.1002%2f2016GL071526&partnerID=40&md5=0cd45a966f3f1785febb2b097b83aa13
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9340
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Physical Sciences, Environment and Technology Research Cluster, Space Weather Group, Landmark University, Omu-Aran, Nigeria
Recommended Citation:
Adebesin B.O.,Pulkkinen A.,Ngwira C.M.. The interplanetary and magnetospheric causes of extreme dB/dt at equatorial locations[J]. Geophysical Research Letters,2016-01-01,43(22).