globalchange  > 科学计划与规划
DOI: 10.1002/2014GL062695
论文题名:
Anisotropic core ion temperatures associated with strong zonal flows and upflows
作者: Archer W.E.; Knudsen D.J.; Burchill J.K.; Patrick M.R.; St.-Maurice J.P.
刊名: Geophysical Research Letters
ISSN: 0094-8933
EISSN: 1944-8664
出版年: 2015
卷: 42, 期:4
起始页码: 981
结束页码: 986
语种: 英语
英文关键词: anisotropy ; ionosphere ; satellite ; swarm ; temperature
Scopus关键词: Electric fields ; Ionosphere ; Ions ; Satellites ; Temperature ; Time delay ; Anisotropy ratio ; Electric field strength ; Ion temperature ; Ion velocity distribution ; Mirror forces ; Swarm ; Temperature anisotropy ; Upward flow ; Anisotropy ; anisotropy ; collision ; core analysis ; electric field ; ionosphere ; satellite data ; temperature profile ; velocity profile ; zonal flow
英文摘要: The Swarm satellites observe strongly anisotropic ion temperatures at 500 km altitude. The ion temperature anisotropy ratios going up to 5 for the strongest electric fields presented in this paper. The largest observed anisotropy ratios exceed the values predicted by theories of collisional heating in strong flows by a factor of 2, indicating that collisional cross sections should perhaps be revised for O+ ion colliding with O. Temperature anisotropy is also found not to be a simple function of electric field strength. This could be understood in terms a time delay needed to advect hot anisotropic ion velocity distributions from strongly collisional regions below 400 km to weakly collisional regions at 500 km and above. The mirror force associated with these events is insufficient to account for the observed upward flows (>500 m/s). For gyroresonant heating to be consistent with our observations, an additional mechanism for field-aligned acceleration is required. ©2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84924875366&doi=10.1002%2f2014GL062695&partnerID=40&md5=225a7dbb5144603f633eab594d47dc34
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8549
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: Department of Physics and Astronomy, University of Calgary, Calgary, AB, Canada

Recommended Citation:
Archer W.E.,Knudsen D.J.,Burchill J.K.,et al. Anisotropic core ion temperatures associated with strong zonal flows and upflows[J]. Geophysical Research Letters,2015-01-01,42(4).
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