DOI: 10.1029/2018JA025347
Scopus记录号: 2-s2.0-85046258820
论文题名: Spatial Distribution of Plasma Sheet Entropy Reduction Caused by a Plasma Bubble: Rice Convection Model Simulations
作者: Wang C.-P. ; Gkioulidou M. ; Lyons L.R. ; Wolf R.A.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 5 起始页码: 3380
结束页码: 3397
语种: 英语
英文关键词: BBF
; electric drift
; entropy reduction
; interchange motion
; magnetic drift
; plasma bubble
英文摘要: We conduct simulations based on the Rice Convection Model to evaluate the spatial distributions of total flux tube entropy (S) in the near-Earth plasma sheet resulting from an earthward moving plasma bubble, and their dependences on two parameters: (1) the bubble's initial magnetic local time location and (2) strength of large-scale convection. The plasma and magnetic field changes caused by the simulated bubble as it moves earthward qualitatively agree with an observed event. The simulated large-scale convection is weaker in the premidnight than postmidnight sector because auroral conductance becomes lower toward dusk. The S reduction region resulting from the bubble expands azimuthally at smaller radial distances. The dawnward expansion is due to electric drift, while the duskward expansion is a result of proton's magnetic drift. The S within the bubble is not conserved as the bubble moves because particles of different energies within the bubble drift apart. The radial and azimuthal extents of the S reduction vary with the bubble's initial magnetic local time location. The S reduction region caused by a premidnight bubble extends substantially closer to the Earth and azimuthally wider than does a postmidnight bubble. This difference is mainly due to the weaker convection in the premidnight sector. Comparing with those under strong convection, the bubble plasma is colder under weak convection so that the bubble transport is affected more by electric drift. The S reductions under weak convection are much more confined in their azimuthal width and do not extend as far inward. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113943
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD, United States; Department of Physics and Astronomy, Rice University, Houston, TX, United States
Recommended Citation:
Wang C.-P.,Gkioulidou M.,Lyons L.R.,et al. Spatial Distribution of Plasma Sheet Entropy Reduction Caused by a Plasma Bubble: Rice Convection Model Simulations[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)