DOI: 10.1002/2015GL067580
论文题名: High-resolution auroral acceleration signatures within a highly dynamic onset arc
作者: Motoba T. ; Hirahara M.
刊名: Geophysical Research Letters
ISSN: 0094-9293
EISSN: 1944-9024
出版年: 2016
卷: 43, 期: 5 起始页码: 1793
结束页码: 1801
语种: 英语
英文关键词: acceleration mechanism
; onset arc
; substorm
Scopus关键词: Earth sciences
; Geophysics
; Accelerated electrons
; Acceleration mechanisms
; Acceleration process
; Field-aligned electrons
; Monoenergetic electrons
; Onset arc
; Small-scale vortices
; Substorms
; Electrons
英文摘要: On 16 March 2006, the Reimei spacecraft observed dynamic small-scale vortex-like structures along an east-west elongated onset arc, subsequently followed by the auroral expansion. Within a few seconds when Reimei crossed over the arc, detailed comparisons of the simultaneous conjugate auroral imaging and particle observations with high resolution were made to reveal the fine-scale acceleration processes acting within/around the flux tube of the bright auroral structures. In the surrounding dark region, Alfvénic accelerated electron fluxes-time-dispersive, field-aligned electron bursts spanning a broad range of energies-became most noticeable. The dominant contributor to the central bright region, on the other hand, was monoenergetic electron fluxes in 3-7 keV at larger pitch angles (>30°) rather than the Alfvénic electron fluxes. The Reimei observations suggest that the Alfvénic acceleration process operates in the vicinity of small-scale auroral structures but plays a less significant role in powering the central bright emissions. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84959454721&doi=10.1002%2f2015GL067580&partnerID=40&md5=2934eb6b1b14e52d4d93cba63fd8ea1d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10256
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: Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
Recommended Citation:
Motoba T.,Hirahara M.. High-resolution auroral acceleration signatures within a highly dynamic onset arc[J]. Geophysical Research Letters,2016-01-01,43(5).