DOI: 10.1002/2013GL058620
论文题名: Dipolarization fronts as a consequence of transient reconnection: In situ evidence
作者: Fu H.S. ; Cao J.B. ; Khotyaintsev Yu.V. ; Sitnov M.I. ; Runov A. ; Fu S.Y. ; Hamrin M. ; André M. ; Retinò A. ; Ma Y.D. ; Lu H.Y. ; Wei X.H. ; Huang S.Y.
刊名: Geophysical Research Letters
ISSN: 0094-8310
EISSN: 1944-8041
出版年: 2013
卷: 40, 期: 23 起始页码: 6023
结束页码: 6027
语种: 英语
英文关键词: dipolarization front
; high-speed flow
; ion diffusion region
; jet braking
; spontaneous formation
; unsteady reconnection
Scopus关键词: Dipolarization
; High speed flows
; Ion diffusion
; Spontaneous formation
; unsteady reconnection
; Earth sciences
; Geophysics
; Diffusion
; ion
; magnetic field
; magnetotail
英文摘要: Dipolarization fronts (DFs) are frequently detected in the Earth's magnetotail from XGSM = -30 RE to XGSM = -7 RE. How these DFs are formed is still poorly understood. Three possible mechanisms have been suggested in previous simulations: (1) jet braking, (2) transient reconnection, and (3) spontaneous formation. Among these three mechanisms, the first has been verified by using spacecraft observation, while the second and third have not. In this study, we show Cluster observation of DFs inside reconnection diffusion region. This observation provides in situ evidence of the second mechanism: Transient reconnection can produce DFs. We suggest that the DFs detected in the near-Earth region (XGSM > -10 RE) are primarily attributed to jet braking, while the DFs detected in the mid- or far-tail region (XGSM < -15 RE) are primarily attributed to transient reconnection or spontaneous formation. In the jet-braking mechanism, the high-speed flow "pushes" the preexisting plasmas to produce the DF so that there is causality between high-speed flow and DF. In the transient-reconnection mechanism, there is no causality between high-speed flow and DF, because the frozen-in condition is violated. Key Points DFs are observed inside reconnection diffusion region Three formation mechanisms of DF are compared Causality between flow and DF is discussed ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84889846532&doi=10.1002%2f2013GL058620&partnerID=40&md5=3733c98b8f811f590fee68073917b9b2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5574
Appears in Collections: 气候减缓与适应
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作者单位: Space Science Institute, School of Astronautics, Beihang University, 37 Xueyuan Rd., Haidian District Beijing, 100191, China
Recommended Citation:
Fu H.S.,Cao J.B.,Khotyaintsev Yu.V.,et al. Dipolarization fronts as a consequence of transient reconnection: In situ evidence[J]. Geophysical Research Letters,2013-01-01,40(23).