DOI: 10.1002/2015GL064474
论文题名: A new upper limit to the field-aligned potential near Titan
作者: Coates A.J. ; Wellbrock A. ; Waite J.H. ; Jones G.H.
刊名: Geophysical Research Letters
ISSN: 0094-8682
EISSN: 1944-8413
出版年: 2015
卷: 42, 期: 12 起始页码: 4676
结束页码: 4684
语种: 英语
英文关键词: ambipolar field
; escape
; ionosphere
; Titan
Scopus关键词: Electric fields
; Interplanetary flight
; Ionosphere
; Ionospheric measurement
; Magnetic fields
; Magnetism
; Magnetosphere
; Photoelectron spectroscopy
; Photoelectrons
; Photons
; Planets
; Spacecraft instruments
; Spectrometers
; Ambipolar electric fields
; Ambipolar field
; Cassini plasma spectrometer
; Characteristic energy
; Earth's magnetosphere
; Electron spectrometer
; Escape
; Titan
; Magnetoplasma
; atomic emission spectroscopy
; electron
; ionization
; ionosphere
; magnetic field
; magnetosphere
; Mars
; Moon
; neutron scattering
; Saturn
; solar radiation
; Titan
; tracer
; Venus
英文摘要: Neutral particles dominate regions of the Saturn magnetosphere and locations near several of Saturn's moons. Sunlight ionizes neutrals, producing photoelectrons with characteristic energy spectra. The Cassini plasma spectrometer electron spectrometer has detected photoelectrons throughout these regions, where photoelectrons may be used as tracers of magnetic field morphology. They also enhance plasma escape by setting up an ambipolar electric field, since the relatively energetic electrons move easily along the magnetic field. A similar mechanism is seen in the Earth's polar wind and at Mars and Venus. Here we present a new analysis of Titan photoelectron data, comparing spectra measured in the sunlit ionosphere at ∼1.4 Titan radii (RT) and at up to 6.8 RT away. This results in an upper limit on the potential of 2.95 V along magnetic field lines associated with Titan at up to 6.8 RT, which is comparable to some similar estimates for photoelectrons seen in Earth's magnetosphere. © 2015. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945494837&doi=10.1002%2f2015GL064474&partnerID=40&md5=6fd9eb0a19192f79556319c0789e686f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8298
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: Mullard Space Science Laboratory, University College London, London, United Kingdom
Recommended Citation:
Coates A.J.,Wellbrock A.,Waite J.H.,et al. A new upper limit to the field-aligned potential near Titan[J]. Geophysical Research Letters,2015-01-01,42(12).