DOI: 10.1002/2015GL065961
论文题名: The competition of electron and ion heating during magnetic reconnection
作者: Haggerty C.C. ; Shay M.A. ; Drake J.F. ; Phan T.D. ; McHugh C.T.
刊名: Geophysical Research Letters
ISSN: 0094-8421
EISSN: 1944-8152
出版年: 2015
卷: 42, 期: 22 起始页码: 9657
结束页码: 9665
语种: 英语
英文关键词: electron heating
; energy partition
; ion heating
; magnetic reconnection
Scopus关键词: Electric fields
; Heating
; Ions
; Magnetism
; Plasma heating
; Electron heating
; Energy partition
; Ion Heating
; Magnetic reconnections
; Normalized temperature
; Parallel electric fields
; Particle-in-cell simulations
; Potential control
; Electrons
; analytical method
; electric field
; electron
; energy flux
; heating
; ion exchange
; magnetic field
; temperature
; thermal power
英文摘要: The physical processes that control the partition of released magnetic energy between electrons and ions during reconnection is explored through particle-in-cell simulations and analytical techniques. We demonstrate that the development of a large-scale parallel electric field and its associated potential controls the relative heating of electrons and ions. The potential develops to restrain heated exhaust electrons and enhances their heating by confining electrons in the region where magnetic energy is released. Simultaneously, the potential slows ions entering the exhaust below the Alfvénic speed expected from the traditional counterstreaming picture of ion heating. Unexpectedly, the magnitude of the potential and therefore the relative partition of energy between electrons and ions is not a constant but rather depends on the upstream parameters and specifically the upstream electron normalized temperature (electron beta). These findings suggest that the fraction of magnetic energy converted into the total thermal energy may be independent of upstream parameters. Key Points Parallel electric field controls relative heating of ions and electrons during reconnection Electric field confines hot exhaust electrons, enhances electron heating, and reduces ion heating The total heating (electron plus ion) is independent of upstream parameters and matches observations. © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956911430&doi=10.1002%2f2015GL065961&partnerID=40&md5=798108d47cd614f343f2104d554c51f2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8037
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: Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, DE, United States
Recommended Citation:
Haggerty C.C.,Shay M.A.,Drake J.F.,et al. The competition of electron and ion heating during magnetic reconnection[J]. Geophysical Research Letters,2015-01-01,42(22).