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Ionospheric photoelectrons at Venus: Initial observations by ASPERA-4 ELS

Coates, AJ; Frahm, RA; Linder, DR; Kataria, DO; Soobiah, Y; Collinson, G; ... Grande, M; + view all (2008) Ionospheric photoelectrons at Venus: Initial observations by ASPERA-4 ELS. PLANET SPACE SCI , 56 (6) 802 - 806. 10.1016/j.pss.2007.12.008.

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Abstract

We report the detection of electrons due to photo-ionization of atomic oxygen and carbon dioxide in the Venus atmosphere by solar helium 30.4 van photons. The detection was by the Analyzer of Space Plasma and Energetic Atoms (ASPERA-4) Electron Spectrometer (ELS) on the Venus Express (VEx) European Space Agency (ESA) mission. Characteristic peaks in energy for such photoelectrons have been predicted by Venus atmosphere/ionosphere models. The ELS energy resolution (Delta E/E similar to 7%) means that these are the first detailed measurements of such electrons. Considerations of ion production and transport in the atmosphere of Venus suggest that the observed photoelectron peaks are due primarily to ionization of atomic oxygen. (c) 2007 Elsevier Ltd. All rights reserved.

Type:Article
Title:Ionospheric photoelectrons at Venus: Initial observations by ASPERA-4 ELS
DOI:10.1016/j.pss.2007.12.008
Keywords:Venus, plasma, ionosphere, DAYSIDE IONOSPHERE, ENERGY PEAKS, MARS, IONOPAUSE, FLUXES
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics

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