| DOI: | 10.1002/2015GL063164
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| 论文题名: | Magnetic reconnection in the auroral acceleration region |
| 作者: | Chaston C.C.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8852
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| EISSN: | 1944-8583
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| 出版年: | 2015
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| 卷: | 42, 期:6 | | 起始页码: | 1646
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| 结束页码: | 1653
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| 语种: | 英语
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| 英文关键词: | aurora
; electric fields
; particle acceleration
; reconnection
; tearing instability
; vorticity
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| Scopus关键词: | Budget control
; Electric fields
; Ionosphere
; Magnetism
; Magnetohydrodynamics
; Vorticity
; Acceleration regions
; aurora
; Guide-field magnetic reconnection
; Magnetic reconnections
; Particle acceleration
; Particle measurement
; reconnection
; Tearing instability
; Magnetoplasma
; acceleration
; aurora
; energy budget
; estimation method
; ionosphere
; magnetic field
; plasma
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| 英文摘要: | Evidence is presented for the operation of extreme guide field magnetic reconnection in the presence of sheared flows in a narrow current sheet through the auroral acceleration region. Using auroral imagery, magnetically conjugate particle measurements and a 3-D reduced MHD simulation, vortical motions in a narrow, rapidly evolving auroral arc indicative of the operation of magnetic tearing are identified. An estimate of the contribution of this process to the observed rate of energy deposition at the ionosphere shows that while this contribution can be significant it remains a minor fraction of the total. These observations are placed in the context of low magnetic shear reconnection made possible in plasmas with low plasma beta. Key Points Magnetic reconnection occurs in narrow discrete auroral arcs Magnetic reconnection can occur for extremely small magnetic shear Magnetic reconnection contributes <20% to the auroral acceleration energy budget ©2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927725437&doi=10.1002%2f2015GL063164&partnerID=40&md5=8de9dd7111c6fe25da44a4eee3aa7719
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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/8468
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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: | School of Physics, University of Sydney, Sydney, NSW, Australia
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| Recommended Citation: | |
Chaston C.C.. Magnetic reconnection in the auroral acceleration region[J]. Geophysical Research Letters,2015-01-01,42(6).
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