DOI: 10.1002/grl.50917
论文题名: Electron bulk heating in magnetic reconnection at Earth's magnetopause: Dependence on the inflow Alfvén speed and magnetic shear
作者: Phan T.D. ; Shay M.A. ; Gosling J.T. ; Fujimoto M. ; Drake J.F. ; Paschmann G. ; Oieroset M. ; Eastwood J.P. ; Angelopoulos V.
刊名: Geophysical Research Letters
ISSN: 0094-8587
EISSN: 1944-8318
出版年: 2013
卷: 40, 期: 17 起始页码: 4475
结束页码: 4480
语种: 英语
英文关键词: electron heating
; magnetic reconnection
; magnetopause
; magnetotail
; solar corona
; solar wind
Scopus关键词: Controlling factors
; Electron heating
; Empirical relations
; Inflow boundary conditions
; Magnetic energies
; Magnetic reconnections
; Magnetotails
; Solar corona
; Electrons
; Magnetopause
; Magnetoplasma
; Plasma density
; Plasma heating
; Solar wind
; Magnetism
; boundary condition
; corona
; electron
; heating
; inflow
; magnetic field
; magnetopause
; magnetotail
; plasma
; solar wind
; spacecraft
英文摘要: We surveyed 79 magnetopause reconnection exhausts detected by the THEMIS spacecraft to investigate how the amount and anisotropy of electron bulk heating produced by reconnection depend on the inflow boundary conditions. We find that the amount of heating, ΔTe, is correlated with the asymmetric Alfvén speed, VAL,asym, based on the reconnecting magnetic field and the plasma density measured in both the high-density magnetosheath and low-density magnetospheric inflow regions. Best fit to the data produces the empirical relation ΔTe = 0.017 miV AL,asym 2, indicating that the amount of heating is proportional to the inflowing magnetic energy per proton-electron pair, with ∼1.7% of the energy being converted into electron heating. This finding, generalized to symmetric reconnection, could account for the lack of electron heating in typical solar wind exhausts at 1 AU, as well as strong heating to keV energies common in magnetotail exhausts. We also find that the guide field suppresses perpendicular heating. Key Points Electron bulk heating controlling factors revealed Heating depends on the total incoming magnetic energy per particle 1.7% of magnetic energy is converted into electron bulk heating ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883678989&doi=10.1002%2fgrl.50917&partnerID=40&md5=45570e48103bc47c5b6b54e08941fd1b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5851
Appears in Collections: 气候减缓与适应
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作者单位: University of California, 7 Gauss Way, Berkeley, CA 94720, United States
Recommended Citation:
Phan T.D.,Shay M.A.,Gosling J.T.,et al. Electron bulk heating in magnetic reconnection at Earth's magnetopause: Dependence on the inflow Alfvén speed and magnetic shear[J]. Geophysical Research Letters,2013-01-01,40(17).