DOI: 10.1002/2014GL062972
论文题名: Solar illumination control of ionospheric outflow above polar cap arcs
作者: Maes L. ; Maggiolo R. ; De Keyser J. ; Dandouras I. ; Fear R.C. ; Fontaine D. ; Haaland S.
刊名: Geophysical Research Letters
ISSN: 0094-8918
EISSN: 1944-8649
出版年: 2015
卷: 42, 期: 5 起始页码: 1304
结束页码: 1311
语种: 英语
英文关键词: cold ion outflow
; ion upflow
; polar cap arc
; polar ionosphere
; polar wind
; solar illumination
Scopus关键词: Electric fields
; Ionosphere
; Ions
; Ion outflow
; Polar cap
; Polar ionospheres
; Polar wind
; Solar illumination
; Ionospheric measurement
; atmospheric electricity
; electric field
; flux measurement
; ionosphere
; magnetic field
; spacecraft
; zenith angle
英文摘要: We measure the flux density, composition, and energy of outflowing ions above the polar cap, accelerated by quasi-static electric fields parallel to the magnetic field and associated with polar cap arcs, using Cluster. Mapping the spacecraft position to its ionospheric foot point, we analyze the dependence of these parameters on the solar zenith angle (SZA). We find a clear transition at SZA between ∼94° and ∼107°, with the O+ flux higher above the sunlit ionosphere. This dependence on the illumination of the local ionosphere indicates that significant O+ upflow occurs locally above the polar ionosphere. The same is found for H+, but to a lesser extent. This effect can result in a seasonal variation of the total ion upflow from the polar ionosphere. Furthermore, we show that low-magnitude field-aligned potential drops are preferentially observed above the sunlit ionosphere, suggesting a feedback effect of ionospheric conductivity. © 2015. The Authors.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925799576&doi=10.1002%2f2014GL062972&partnerID=40&md5=3e62b1a949632c741fc9572545a40bfe
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8534
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: Belgian Institute for Space Aeronomy, Brussels, Belgium
Recommended Citation:
Maes L.,Maggiolo R.,De Keyser J.,et al. Solar illumination control of ionospheric outflow above polar cap arcs[J]. Geophysical Research Letters,2015-01-01,42(5).