DOI: 10.1002/2013JD020247
论文题名: Plasma turbulence of nonspecular trail plasmas as measured by a high-power large-aperture radar
作者: Yee J. ; Close S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 24 起始页码: 13449
结束页码: 13462
语种: 英语
英文关键词: diffusion coefficients
; nonspecular meteor trails
; radar measurements
Scopus关键词: Electric fields
; Ionization of gases
; Magnetic fields
; Magnetohydrodynamics
; Plasma turbulence
; Plasmas
; Polarization
; Radar measurement
; Radar tracking
; Tracking radar
; Advanced research project agencies
; Ambipolar diffusion coefficients
; External electric field
; Field-aligned irregularities
; Large aperture
; Meteor trails
; Turbulence onset
; Turbulent diffusion
; Diffusion
; azimuth
; electrical method
; magnetic field
; meteorology
; numerical model
; plasma
; polarization
; radar
; resolution
; turbulence
英文摘要: High-power, large-aperture radars have been used to characterize plasmas formed as meteoroids ablate in Earth's atmosphere. These plasmas are referred to as heads, the plasmas surrounding the meteoroids, and trails, the plasmas left behind by the meteoroids. A subset of trails is nonspecular trails, which are detected when the radar beam is quasi-perpendicular to the magnetic field. Radar returns from trail plasma are thought to originate from field-aligned irregularity reflections that form due to turbulence within the trail. In this paper, we present theory and analysis of plasma trail diffusion using nonspecular trails detected by the Advanced Research Project Agency Long-range Tracking and Identification Radar. These data include dual frequency, dual polarized, and high-range resolution in-phase and quadrature returns with azimuth and elevation data. We present turbulence onset times for nonspecular trails and derive comparisons to models. We compare diffusion coefficients calculated from the decay in signal return with ambipolar diffusion coefficients derived for specular meteor trails. These results, in conjunction with an analysis of the diffusion perpendicular and parallel to the magnetic field, demonstrate that the ambipolar diffusion coefficient is not a sufficient description of the turbulent diffusion in nonspecular trails and that other influences, such as external electric fields and anomalous cross-field diffusion, must be considered when calculating the diffusion coefficients of nonspecular trails. In addition, we examined these results with respect to the polarization of the returns and found similar trends between all polarizations with slight differences for the right circular return. Key Points Time delay and diffusion coefficients measured for nonspecular meteor trails Nonspecular meteor trail diffusion relative to the magnetic field are compared Ambipolar diffusion coefficient not adequate for describing trail diffusion ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 119-000222-1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63080
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Aeronautics and Astronautics Department, Stanford University, 496 Lomita Mall, Stanford, CA 94305, United States
Recommended Citation:
Yee J.,Close S.. Plasma turbulence of nonspecular trail plasmas as measured by a high-power large-aperture radar[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(24)