| DOI: | 10.1002/2016GL069892
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| 论文题名: | Cross-field current instability for auroral bead formation in breakup arcs |
| 作者: | Lui A.T.Y.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9719
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| EISSN: | 1944-9450
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| 出版年: | 2016
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| 卷: | 43, 期:12 | | 起始页码: | 6087
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| 结束页码: | 6095
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| 语种: | 英语
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| 英文关键词: | auroral beads
; prebreakup auroral arcs
; substorms
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| Scopus关键词: | Plasma theory
; Stability
; Auroral arcs
; auroral beads
; Ballooning instability
; Bead formation
; Field currents
; Physical process
; Substorm expansion
; Substorms
; Shear flow
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| 英文摘要: | The physical process responsible for the onset of substorm expansion is still unresolved in spite of decades of research on the topic. Detailed properties of the spatially periodic auroral beads on prebreakup auroral arcs that initiate substorm expansion onset are now available. These auroral bead properties impose severe observational constraints on the onset process. In this work, theoretical predictions of the cross-field current instability are evaluated in terms of these constraints. The growth rates and wavelengths associated with auroral beads in several previously published events are reproduced by the cross-field current instability, implying that the instability can indeed account for the characteristics of auroral beads that eventually lead to substorm onset. The present results differ from the conclusion reached by a previous analysis that the shear flow ballooning instability can account for the growth and spatial scales of auroral beads better than the cross-field current instability. ©2016. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84983261738&doi=10.1002%2f2016GL069892&partnerID=40&md5=8bdad22288b8687464860aa3c5d84dd8
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/10682
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| 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: | JHU/APL, Laurel, MD, United States
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| Recommended Citation: | |
Lui A.T.Y.. Cross-field current instability for auroral bead formation in breakup arcs[J]. Geophysical Research Letters,2016-01-01,43(12).
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