DOI: 10.1002/2015GL065168
论文题名: Ion temperature anisotropy across a magnetotail reconnection jet
作者: Hietala H. ; Drake J.F. ; Phan T.D. ; Eastwood J.P. ; McFadden J.P.
刊名: Geophysical Research Letters
ISSN: 0094-8586
EISSN: 1944-8317
出版年: 2015
卷: 42, 期: 18 起始页码: 7239
结束页码: 7247
语种: 英语
英文关键词: ion heating
; magnetic reconnection
; magnetotail
; temperature anisotropy
Scopus关键词: Digital storage
; Ions
; Magnetoplasma
; Plasma diagnostics
; Plasma heating
; Plasma simulation
; Plasma stability
; Spacecraft
; Ion Heating
; Magnetic reconnections
; Magnetotail reconnection
; Magnetotails
; Particle-in-cell simulations
; Spatial variations
; Temperature anisotropy
; Total temperatures
; Anisotropy
; anisotropy
; heating
; jet
; magnetic anisotropy
; spacecraft
; spatial variation
英文摘要: A significant fraction of the energy released by magnetotail reconnection appears to go into ion heating, but this heating is generally anisotropic. We examine ARTEMIS dual-spacecraft observations of a long-duration magnetotail exhaust generated by antiparallel reconnection in conjunction with particle-in-cell simulations, showing spatial variations in the anisotropy across the outflow far (>100di) downstream of the X line. A consistent pattern is found in both the spacecraft data and the simulations: While the total temperature across the exhaust is rather constant, near the boundaries Ti,|| dominates. The plasma is well above the firehose threshold within patchy spatial regions at |BX|[0.1,0.5]B0, suggesting that the drive for the instability is strong and the instability is too weak to relax the anisotropy. At the midplane (|BX|0.1B0), Ti,>Ti,|| and ions undergo Speiser-like motion despite the large distance from the X line. © 2015 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945488190&doi=10.1002%2f2015GL065168&partnerID=40&md5=4a50d286ee4442a7a4a8d3fa96b47fdd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8202
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: Blackett Laboratory, Imperial College, London, United Kingdom
Recommended Citation:
Hietala H.,Drake J.F.,Phan T.D.,et al. Ion temperature anisotropy across a magnetotail reconnection jet[J]. Geophysical Research Letters,2015-01-01,42(18).