DOI: 10.1002/2014GL061547
论文题名: Ion bulk heating in magnetic reconnection exhausts at Earth's magnetopause: Dependence on the inflow Alfvén speed and magnetic shear angle
作者: Phan T.D. ; Drake J.F. ; Shay M.A. ; Gosling J.T. ; Paschmann G. ; Eastwood J.P. ; Oieroset M. ; Fujimoto M. ; Angelopoulos V.
刊名: Geophysical Research Letters
ISSN: 0094-9679
EISSN: 1944-9410
出版年: 2014
卷: 41, 期: 20 起始页码: 7002
结束页码: 7010
语种: 英语
英文关键词: ion heating
; magnetic reconnection
; magnetopause
; magnetotail
; solar wind
Scopus关键词: Heating
; Ions
; Magnetism
; Magnetopause
; Plasma heating
; Protons
; Solar wind
; Empirical relations
; Inflow boundary conditions
; Ion Heating
; Magnetic energies
; Magnetic reconnections
; Magnetic shear
; Magnetotails
; Number density
; Magnetoplasma
; boundary condition
; fundamental particle
; heating
; magnetic property
; magnetopause
; solar wind
英文摘要: We surveyed 87 magnetopause reconnection exhausts detected by the THEMIS spacecraft to investigate how the amount and anisotropy of ion bulk heating depend on the inflow boundary conditions. We find that the heating, ΔTi , is correlated with the asymmetric Alfvén speed, VAL,asym , based on the reconnecting magnetic field and the plasma number density measured in both inflow regions. Best fit to the data produces the empirical relation ΔTi = 0.13 mi VAL,asym 2, where mi is the proton mass, indicating that the increase in the ion internal (thermal) energy, 3ΔTi /2, is 20% of the available magnetic energy per proton-electron pair. The observed parallel heating generally exceeds perpendicular heating (by a factor of ∼2), and there are some indications that the heating is reduced in the presence of a strong guide field. Finally, the ratio of ion to electron bulk heating is ∼8 on average. Key Points Factors controlling ion heating in reconnection at magnetopause revealedIon heating linearly dependent on inflow magnetic energy per particleIon heating is 13% of available magnetic energy per particle ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911409009&doi=10.1002%2f2014GL061547&partnerID=40&md5=a1734f0527eb47a220ded7168011d63e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6943
Appears in Collections: 气候减缓与适应
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作者单位: University of California, Berkeley, CA, United States
Recommended Citation:
Phan T.D.,Drake J.F.,Shay M.A.,et al. Ion bulk heating in magnetic reconnection exhausts at Earth's magnetopause: Dependence on the inflow Alfvén speed and magnetic shear angle[J]. Geophysical Research Letters,2014-01-01,41(20).