| DOI: | 10.1002/2016GL070980
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| 论文题名: | Dipolarization front and current disruption |
| 作者: | Lui A.T.Y.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8539
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| EISSN: | 1944-8270
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| 出版年: | 2016
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| 卷: | 43, 期:19 | | 起始页码: | 10050
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| 结束页码: | 10058
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| 语种: | 英语
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| 英文关键词: | current disruption
; dipolarization front
; substorms
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| Scopus关键词: | Current density
; Ions
; Particle beam dynamics
; Plasma sheaths
; 3-D PIC simulations
; Current disruption
; Dipolarization
; Nonlinear evolutions
; Particle-in-cell simulations
; Substorms
; Threedimensional (3-d)
; Two Dimensional (2 D)
; Plasma simulation
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| 英文摘要: | The modification of current density on the dawn-dusk cross section of the magnetotail with the earthward approach of a dipolarization front (DF) is examined through the recently published results of a three-dimensional (3-D) particle-in-cell (PIC) simulation. It is found that the current density intensifies by ~37% abruptly within ~1.5 ion gyrotime as the DF approaches and shows localized regions with north-south extrusions. After reaching its peak value, it undergoes a drastic current reduction (DCR) by ~65% within ~2 ion gyrotime. Breakdown of the frozen-in condition occurs in the neutral sheet region in association with DCR, demonstrating the non-MHD behavior of the phenomenon. The evolution of current density from this 3-D PIC simulation bears several similarities to those observed for the current disruption (CD) phenomenon, such as explosive growth and disruption of the current density leading to a breakdown of the frozen-in condition. The evolution is also similar to those from a previous two-dimensional (2-D) PIC simulation specially designed to investigate the nonlinear evolution of the cross-field current instability for CD. One interpretation of these findings is that CD and substorm triggering can be associated with earthward intrusion of a DF into the near-Earth plasma sheet as indicated by previous Cluster and Time History of Events and Macroscale Interactions during Substorms observations. An alternative interpretation is that both DF and CD are consequences of a global evolution from an ion-tearing-like instability of the magnetotail. ©2016. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84992449537&doi=10.1002%2f2016GL070980&partnerID=40&md5=8b3370b5b913def2d467e0d455fa01ad
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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/9502
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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.. Dipolarization front and current disruption[J]. Geophysical Research Letters,2016-01-01,43(19).
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