DOI: 10.1029/2017JA024405
Scopus记录号: 2-s2.0-85047641171
论文题名: On the Persistent Shape and Coherence of Pulsating Auroral Patches
作者: Humberset B.K. ; Gjerloev J.W. ; Mann I.R. ; Michell R.G. ; Samara M.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 5 起始页码: 4272
结束页码: 4289
语种: 英语
英文关键词: auroral characteristics
; auroral patch
; convection
; fluctuating aurora
; pulsating aurora
英文摘要: The pulsating aurora covers a broad range of fluctuating shapes that are poorly characterized. The purpose of this paper is therefore to provide objective and quantitative measures of the extent to which pulsating auroral patches maintain their shape, drift and fluctuate in a coherent fashion. We present results from a careful analysis of pulsating auroral patches using all-sky cameras. We have identified four well-defined individual patches that we follow in the patch frame of reference. In this way we avoid the space-time ambiguity which complicates rocket and satellite measurements. We find that the shape of the patches is remarkably persistent with 85–100% of the patch being repeated for 4.5–8.5 min. Each of the three largest patches has a temporal correlation with a negative dependence on distance, and thus does not fluctuate in a coherent fashion. A time-delayed response within the patches indicates that the so-called streaming mode might explain the incoherency. The patches appear to drift differently from the SuperDARN-determined E × B convection velocity. However, in a nonrotating reference frame the patches drift with 230–287 m/s in a north eastward direction, which is what typically could be expected for the convection return flow. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113910
Appears in Collections: 气候减缓与适应
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作者单位: Birkeland Centre for Space Science, Department of Physics and Technology, University of Bergen, Bergen, Norway; The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States; Department of Physics, University of Alberta, Edmonton, AB, Canada; Department of Astronomy, University of Maryland, College Park, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Humberset B.K.,Gjerloev J.W.,Mann I.R.,et al. On the Persistent Shape and Coherence of Pulsating Auroral Patches[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)