DOI: 10.1002/2014GL062204
论文题名: Direct measurement of lower thermospheric neutral density using multifrequency incoherent scattering
作者: Nicolls M.J. ; Bahcivan H. ; Häggström I. ; Rietveld M.
刊名: Geophysical Research Letters
ISSN: 0094-9556
EISSN: 1944-9287
出版年: 2014
卷: 41, 期: 23 起始页码: 8147
结束页码: 8154
语种: 英语
英文关键词: collision frequency
; incoherent scatter
; lower thermosphere
; mesosphere
; neutral density
Scopus关键词: Equations of state
; Incoherent scattering
; Ionosphere
; Ions
; Radar systems
; Collision frequency
; Collisional properties
; Ion-neutral collision frequency
; Lower thermosphere
; Mesosphere
; Mesosphere and lower thermosphere
; Multifrequency measurements
; Neutral densities
; Radar measurement
; collision
; electron density
; frequency analysis
; mesosphere
; radar imagery
; wave scattering
英文摘要: Incoherent scatter (IS) is sensitive to collisional properties of the ion gas when the mean free path is close to the radar wave number. However, it has been traditionally difficult to infer the rate of collisions from IS measurements because of ambiguities in the theory for measurements at a single wave number (k). We demonstrate that multifrequency measurements to achieve diversity in k can allow for direct inference of the composition-weighted ion-neutral collision frequency in the upper mesosphere and lower thermosphere. By direct, we mean that no significant constraints are imposed on the interpretation of the IS spectra and that interpretation relies only on the IS formalism (rather than a steady state ion-momentum equation, for example). The technique is demonstrated using measurements from the European Incoherent Scatter VHF and UHF radar systems. This technique can be used to investigate neutral atmosphere variations as well as the validity of collision models commonly used in the IS formalism. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921546462&doi=10.1002%2f2014GL062204&partnerID=40&md5=0b5cc94099d633fd4d633119a09a63b3
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6820
Appears in Collections: 气候减缓与适应
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作者单位: Center for Geospace Studies, SRI International, Menlo Park, CA, United States
Recommended Citation:
Nicolls M.J.,Bahcivan H.,Häggström I.,et al. Direct measurement of lower thermospheric neutral density using multifrequency incoherent scattering[J]. Geophysical Research Letters,2014-01-01,41(23).