DOI: 10.1002/2014GL062009
论文题名: Ion-scale spectral break of solar wind turbulence at high and low beta
作者: Chen C.H.K. ; Leung L. ; Boldyrev S. ; Maruca B.A. ; Bale S.D.
刊名: Geophysical Research Letters
ISSN: 0094-9566
EISSN: 1944-9297
出版年: 2014
卷: 41, 期: 22 起始页码: 8081
结束页码: 8088
语种: 英语
英文关键词: plasma
; solar wind
; turbulence
Scopus关键词: Plasmas
; Protons
; Turbulence
; Current sheets
; Ion plasmas
; Magnetic fluctuation
; Plasma frame
; Solar-wind turbulence
; Spacecraft frames
; Spatial scale
; Two-power laws
; Solar wind
; frequency analysis
; magnetic property
; plasma
; solar wind
; spectral analysis
; turbulence
英文摘要: The power spectrum of magnetic fluctuations in the solar wind at 1 AU displays a break between two power laws in the range of spacecraft-frame frequencies 0.1 to 1 Hz. These frequencies correspond to spatial scales in the plasma frame near the proton gyroradius ρi and proton inertial length di . At 1 AU it is difficult to determine which of these is associated with the break, since di=ρi/βi and the perpendicular ion plasma beta is typically βi ∼1. To address this, several exceptional intervals with βi 蠐1 and βi 蠑1 were investigated, during which these scales were well separated. It was found that for βi 蠐1 the break occurs at di and for βi 蠑1 at ρi , i.e., the larger of the two scales. Possible explanations for these results are discussed, including Alfvén wave dispersion, damping, and current sheets. © 2014. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921867846&doi=10.1002%2f2014GL062009&partnerID=40&md5=db1a798dd2997ba6824da646734f7ccf
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6830
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics, Imperial College London, London, United Kingdom
Recommended Citation:
Chen C.H.K.,Leung L.,Boldyrev S.,et al. Ion-scale spectral break of solar wind turbulence at high and low beta[J]. Geophysical Research Letters,2014-01-01,41(22).