DOI: 10.1002/2014GL062400
论文题名: Increases in plasma sheet temperature with solar wind driving during substorm growth phases
作者: Forsyth C. ; Watt C.E.J. ; Rae I.J. ; Fazakerley A.N. ; Kalmoni N.M.E. ; Freeman M.P. ; Boakes P.D. ; Nakamura R. ; Dandouras I. ; Kistler L.M. ; Jackman C.M. ; Coxon J.C. ; Carr C.M.
刊名: Geophysical Research Letters
ISSN: 0094-9477
EISSN: 1944-9208
出版年: 2014
卷: 41, 期: 24 起始页码: 8713
结束页码: 8721
语种: 英语
英文关键词: growth phase
; plasma sheet
; substorm
; temperature
Scopus关键词: Plasma diagnostics
; Plasma sheaths
; Solar wind
; Temperature
; Adiabatic process
; Growth phase
; Magnetic reconnections
; Magnetotail lobes
; Plasma sheet
; Pressure and temperature
; Substorm expansion
; Substorms
; Magnetoplasma
; adiabatic process
; cluster analysis
; magnetopause
; magnetosphere
; magnetotail
; plasma
; pressure gradient
; solar wind
; temperature gradient
; thermodynamics
英文摘要: During substorm growth phases, magnetic reconnection at the magnetopause extracts ~1015 J from the solar wind which is then stored in the magnetotail lobes. Plasma sheet pressure increases to balance magnetic flux density increases in the lobes. Here we examine plasma sheet pressure, density, and temperature during substorm growth phases using 9 years of Cluster data (>316,000 data points). We show that plasma sheet pressure and temperature are higher during growth phases with higher solar wind driving, whereas the density is approximately constant. We also show a weak correlation between plasma sheet temperature before onset and the minimum SuperMAG AL (SML) auroral index in the subsequent substorm. We discuss how energization of the plasma sheet before onset may result from thermodynamically adiabatic processes; how hotter plasma sheets may result in magnetotail instabilities, and how this relates to the onset and size of the subsequent substorm expansion phase. Key Points Growth phase plasma sheet temperature varies with solar wind drivingHigher temperatures observed in intervals of higher drivingPlasma sheet temperature can influence substorm onset and size ©2014. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921868225&doi=10.1002%2f2014GL062400&partnerID=40&md5=bfb83fa0265657639245feb6d52f0c5d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6741
Appears in Collections: 气候减缓与适应
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作者单位: UCL Mullard Space Science Laboratory, Dorking, United Kingdom
Recommended Citation:
Forsyth C.,Watt C.E.J.,Rae I.J.,et al. Increases in plasma sheet temperature with solar wind driving during substorm growth phases[J]. Geophysical Research Letters,2014-01-01,41(24).