DOI: 10.1002/2017JA024606
Scopus记录号: 2-s2.0-85040692664
论文题名: Super-Alfvénic Propagation and Damping of Reconnection Onset Signatures
作者: SharmaPyakurel P. ; Shay M.A. ; Haggerty C.C. ; Parashar T.N. ; Drake J.F. ; Cassak P.A. ; Gary S.P.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 1 起始页码: 341
结束页码: 349
语种: 英语
英文关键词: kinetic Alfvén waves
; Landau damping
; magnetic reconnection
; magnetotail
英文摘要: The quadrupolar out-of-plane Hall magnetic field generated during collisionless reconnection propagates away from the x line as a kinetic Alfvén wave (KAW). While it has been shown that this KAW carries substantial Poynting flux and propagates super-Alfvenically, how this KAW damps as it propagates away from the x line is not well understood. In this study, this damping is examined using kinetic particle-in-cell simulations of antiparallel symmetric magnetic reconnection in a one-dimensional current sheet equilibrium. In the reconnection simulations, the KAW wave vector has a typical magnitude comparable to an inverse fluid Larmor radius (effectively an inverse ion Larmor radius) and a direction of 85–89° relative to the local magnetic field. We find that the damping of the reconnection KAW is consistent with linear Landau damping results from a numerical Vlasov dispersion solver. This knowledge allows us to generalize our damping predictions to regions in the magnetotail and solar corona where the magnetic geometry can be approximated as a current sheet. For the magnetotail, the KAW from reconnection will not damp away before propagating the approximately 20 Earth radii associated with global magnetotail distances. For the solar corona, on the other hand, these KAWs will completely damp before reaching the distances comparable to the flare loop length. ©2017. 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/114783
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics and Astronomy, University of Delaware, Newark, DE, United States; University of Maryland, College Park, MD, United States; Department of Physics and Astronomy, West Virginia University, Morgantown, WV, United States; Space Science Institute, Boulder, CO, United States
Recommended Citation:
SharmaPyakurel P.,Shay M.A.,Haggerty C.C.,et al. Super-Alfvénic Propagation and Damping of Reconnection Onset Signatures[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)