Coates, AJ and Frahm, RA and Linder, DR and Kataria, DO and Soobiah, Y and Collinson, G and Sharber, JR and Winningham, JD and Jeffers, SJ and Barabash, S and Sauvaud, JA and Lundin, R and Holmstrom, M and Futaana, Y and Yamauchi, M and Grigoriev, A and Andersson, H and Gunell, H and Fedorov, A and Thocaven, JJ and Zhang, TL and Baumjohann, W and Kallio, E and Koskinen, H and Kozyra, JU and Liemohn, MW and Ma, Y and Galli, A and Wurz, P and Bochsler, P and Brain, D and Roelof, EC and Brandt, P and Krupp, N and Woch, J and Fraenz, M and Dubinin, E and McKenna-Lawlor, S and Orsini, S and Cerulli-Irelli, R and Mura, A and Milillo, A and Maggi, M and Curtis, CC and Sandel, BR and Hsieh, KC and Szego, K and Asamura, A and Grande, M (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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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.
|Title:||Ionospheric photoelectrons at Venus: Initial observations by ASPERA-4 ELS|
|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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