Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL076485 |
Flow Shears at the Poleward Boundary of Omega Bands Observed During Conjunctions of Swarm and THEMIS ASI | |
Liu, Jiang1,2,3; Lyons, L. R.1; Archer, W. E.4; Gallardo-Lacourt, B.5; Nishimura, Y.6,7,8; Zou, Ying6,7; Gabrielse, C.1,2,3; Weygand, J. M.2,3 | |
2018-02-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:3页码:1218-1227 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Canada |
英文摘要 | Omega bands are curved aurora forms that evolve from a quiet arc located along the poleward edge of a diffuse auroral band within the midnight to morningside auroral oval. They usually propagate eastward. Because omega bands are a significant contributor to an active magnetotail, knowledge about their generation is important for understanding tail dynamics. Previous studies have shown that auroral streamers, footprints of fast flows in the tail, can propagate into omega bands. Such events, however, are limited, and it is still unclear whether and how the flows trigger the bands. The ionospheric flows associated with omega bands may provide valuable information on the driving mechanisms of the bands. We examine these flows taking advantage of the conjunctions between the Swarm spacecraft and Time History of Events and Macroscale Interactions during Substorms all-sky imagers, which allow us to demonstrate the relative location of the flows to the omega bands' bright arcs for the first time. We find that a strong eastward ionospheric flow is consistently present immediately poleward of the omega band's bright arc, resulting in a sharp flow shear near the poleward boundary of the band. This ionospheric flow shear should correspond to a flow shear near the inner edge of the plasma sheet. This plasma sheet shear may drive a Kelvin-Helmholz instability which then distorts the quiet arc to form omega bands. It seems plausible that the strong eastward flows are driven by streamer-related fast flows or enhanced convection in the magnetotail. |
英文关键词 | omega band flow shear aurora substorm ionospheric flow Kelvin-Helmholz instability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000426161800003 |
WOS关键词 | FIELD-ALIGNED CURRENTS ; BURSTY BULK FLOWS ; RCM-E SIMULATION ; MAGNETIC-FIELD ; AURORAL SUBSTORMS ; ELECTRIC-FIELDS ; PLASMA SHEET ; ARC ; MAGNETOMETER ; ELECTRODYNAMICS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/28532 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA; 2.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA; 3.Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA; 4.Univ Saskatchewan, Dept Phys & Engn Phys, Saskatoon, SK, Canada; 5.Univ Calgary, Dept Phys & Astron, Calgary, AB, Canada; 6.Boston Univ, Dept Astron, 725 Commonwealth Ave, Boston, MA 02215 USA; 7.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA; 8.Boston Univ, Dept Elect & Comp Engn, Boston, MA 02215 USA |
推荐引用方式 GB/T 7714 | Liu, Jiang,Lyons, L. R.,Archer, W. E.,et al. Flow Shears at the Poleward Boundary of Omega Bands Observed During Conjunctions of Swarm and THEMIS ASI[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(3):1218-1227. |
APA | Liu, Jiang.,Lyons, L. R..,Archer, W. E..,Gallardo-Lacourt, B..,Nishimura, Y..,...&Weygand, J. M..(2018).Flow Shears at the Poleward Boundary of Omega Bands Observed During Conjunctions of Swarm and THEMIS ASI.GEOPHYSICAL RESEARCH LETTERS,45(3),1218-1227. |
MLA | Liu, Jiang,et al."Flow Shears at the Poleward Boundary of Omega Bands Observed During Conjunctions of Swarm and THEMIS ASI".GEOPHYSICAL RESEARCH LETTERS 45.3(2018):1218-1227. |
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