DOI: 10.1029/2017JA025082
Scopus记录号: 2-s2.0-85046761362
论文题名: The Association of High-Latitude Dayside Aurora With NBZ Field-Aligned Currents
作者: Carter J.A. ; Milan S.E. ; Fogg A.R. ; Paxton L.J. ; Anderson B.J.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 5 起始页码: 3637
结束页码: 3645
语种: 英语
英文关键词: aurora
; field-aligned current
; high-latitude auroral emissions
; ionosphere
英文摘要: The relationship between auroral emissions in the polar ionosphere and the large-scale flow of current within the Earth's magnetosphere has yet to be comprehensively established. Under northward interplanetary magnetic field (IMF) conditions, magnetic reconnection occurs at the high-latitude magnetopause, exciting two reverse lobe convection cells in the dayside polar ionosphere and allowing ingress of solar wind plasma to form an auroral “cusp spot” by direct impact on the atmosphere. It has been hypothesized that a second class of NBZ auroras, High-latitude Dayside Aurora, are produced by upward field-aligned currents associated with lobe convection. Here we present data from the Special Sensor Ultraviolet Spectrographic Imager instrument and from the Active Magnetosphere and Planetary Electrodynamics Response Experiment, from January 2010 to September 2013, in a large statistical study. We reveal a northward IMF auroral phenomenon that is located adjacent to the cusp spot and that is colocated with a region of upward electrical current in the clockwise-rotating lobe cell. The emission only occurs in the sunlit summer hemisphere, demonstrating the influence of the conductance of the ionosphere on current closure. In addition, fast solar wind speed is required for this emission to be bright. The results show that dayside auroral emission is produced by IMF-magnetosphere electrodynamic coupling, as well as by direct impact of the atmosphere by the solar wind, confirming the association of High-latitude Dayside Aurora with NBZ currents. ©2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113932
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics and Astronomy, University of Leicester, Leicester, United Kingdom; Birkeland Centre for Space Science, Department of Physics and Technology, University of Bergen, Bergen, Norway; The John Hopkins University Applied Physics Laboratory, Laurel, MD, United States
Recommended Citation:
Carter J.A.,Milan S.E.,Fogg A.R.,et al. The Association of High-Latitude Dayside Aurora With NBZ Field-Aligned Currents[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)