DOI: 10.1002/2017JA024999
Scopus记录号: 2-s2.0-85046280379
论文题名: Measurements of Ion-Neutral Coupling in the Auroral F Region in Response to Increases in Particle Precipitation
作者: Kiene A. ; Bristow W.A. ; Conde M.G. ; Hampton D.L.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 5 起始页码: 3900
结束页码: 3918
语种: 英语
英文关键词: Auroral precipitation
; Coupling time scales
; F-Region
; Ion drifts
; Ion-neutral coupling
; Neutral winds
英文摘要: Neutral winds are a key factor in the dynamics of the ionosphere-thermosphere system. Previous observations have shown that neutral and ion flows are strongly coupled during periods of auroral activity when ion drag forcing can become the dominant force driving neutral wind flow. This is primarily due to increases in ion density due to enhanced particle precipitation as well as associated increases the strength of the electric fields that drive ion motions. Due to this strong coupling, numerical simulations of neutral dynamics have difficulty reproducing neutral wind observations when they are driven by modeled precipitation and modeled convection. It is therefore desirable whenever possible to have concurrent coincident measurements of auroral precipitation and ion convection. Recent advancements in high-resolution fitting of Super Dual Auroral Radar Network ion convection data have enabled the generation of steady maps of ion drifts over Alaska, coinciding with several optics sites. The Super Dual Auroral Radar Network measurements are compared with scanning Doppler imager neutral wind measurements at similar altitude, providing direct comparisons of ion and neutral velocities over a wide field and for long periods throughout the night. Also present are a digital all-sky imager and a meridian spectrograph, both of which provide measurements of auroral intensity on several wavelengths. In this study, we combine these data sets to present three case studies that show significant correlation between increases in F region precipitation and enhancements in ion-neutral coupling in the evening sector. We investigate the time scales over which the coupling takes place and compare our findings to previous measurements. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113911
Appears in Collections: 气候减缓与适应
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作者单位: Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States
Recommended Citation:
Kiene A.,Bristow W.A.,Conde M.G.,et al. Measurements of Ion-Neutral Coupling in the Auroral F Region in Response to Increases in Particle Precipitation[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)