DOI: 10.1029/2018JA025410
Scopus记录号: 2-s2.0-85050256070
论文题名: Orientation and Stability of Asymmetric Magnetic Reconnection X Line
作者: Liu Y.-H. ; Hesse M. ; Li T.C. ; Kuznetsova M. ; Le A.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 6 起始页码: 4908
结束页码: 4920
语种: 英语
英文关键词: 3-D magnetic reconnection
; maximal reconection rate
; oblique tearing modes
; particle-in-cell simulations
; x line orientation
; x line stability
英文摘要: The orientation and stability of the reconnection x line in asymmetric geometry is studied using three-dimensional (3-D) particle-in-cell simulations. We initiate reconnection at the center of a large simulation domain to minimize the boundary effect. The resulting x line has sufficient freedom to develop along an optimal orientation, and it remains laminar. Companion 2-D simulations indicate that this x line orientation maximizes the reconnection rate. The divergence of the nongyrotropic pressure tensor breaks the frozen-in condition, consistent with its 2-D counterpart. We then design 3-D simulations with one dimension being short to fix the x line orientation but long enough to allow the growth of the fastest growing oblique tearing modes. This numerical experiment suggests that reconnection tends to radiate secondary oblique tearing modes if it is externally (globally) forced to proceed along an orientation not favored by the local physics. The development of oblique structure easily leads to turbulence inside small periodic systems. ©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/113790
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics and Astronomy, Dartmouth College, Hanover, NH, United States; Department of Physics and Technology, University of Bergen, Bergen, Norway; Southwest Research Institute, San Antonio, TX, United States; NASA-Goddard Space Flight Center, Greenbelt, MD, United States; Los Alamos National Laboratory, Los Alamos, NM, United States
Recommended Citation:
Liu Y.-H.,Hesse M.,Li T.C.,et al. Orientation and Stability of Asymmetric Magnetic Reconnection X Line[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(6)