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

A. J. Coates; R. A. Frahm; D. R. Linder; D. O. Kataria; Y. Soobiah; G. Collinson; J. R. Sharber; J. D. Winningham; S. J. Jeffers; S. Barabash; J. A. Sauvaud; R. Lundin; M. Holmström; Y. Futaana; M. Yamauchi; A. Grigoriev; H. Andersson; H. Gunell; A. Fedorov; J. -J. Thocaven; T. L. Zhang; W. Baumjohann; E. Kallio; H. Koskinen; J. U. Kozyra; M. W. Liemohn; Y. Ma; A. Galli; P. Wurz; P. Bochsler; D. Brain; E. C. Roelof; P. Brandt; N. Krupp; J. Woch; M. Fraenz; E. Dubinin; S. McKenna-Lawlor; S. Orsini; R. Cerulli-Irelli; A. Mura; A. Milillo; M. Maggi; C. C. Curtis; B. R. Sandel; K. C. Hsieh; K. Szego; A. Asamura; M. Grande

doi:10.1016/j.pss.2007.12.008

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

A. J. Coates, R. A. Frahm, D. R. Linder, D. O. Kataria, Y. Soobiah, G. Collinson, J. R. Sharber, J. D. Winningham, S. J. Jeffers, S. Barabash, J. A. Sauvaud, R. Lundin, M. Holmström, Y. Futaana, M. Yamauchi, A. Grigoriev, H. Andersson, H. Gunell, A. Fedorov, J. -J. ThocavenT. L. Zhang, W. Baumjohann, E. Kallio, H. Koskinen, J. U. Kozyra, M. W. Liemohn, Y. Ma, A. Galli, P. Wurz, P. Bochsler, D. Brain, E. C. Roelof, P. Brandt, N. Krupp, J. Woch, M. Fraenz, E. Dubinin, S. McKenna-Lawlor, S. Orsini, R. Cerulli-Irelli, A. Mura, A. Milillo, M. Maggi, C. C. Curtis, B. R. Sandel, K. C. Hsieh, K. Szego, A. Asamura, M. Grande

Department of Physics

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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 nm 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 (ΔE/E∼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.

Original language	English
Pages (from-to)	802-806
Number of pages	5
Journal	Planetary and Space Science
Volume	56
Issue number	6
DOIs	https://doi.org/10.1016/j.pss.2007.12.008
Publication status	Published - May 2008

Keywords

Venus
plasma
IONOSPHERE

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Coates, A. J., Frahm, R. A., Linder, D. R., Kataria, D. O., Soobiah, Y., Collinson, G., Sharber, J. R., Winningham, J. D., Jeffers, S. J., Barabash, S., Sauvaud, J. A., Lundin, R., Holmström, M., Futaana, Y., Yamauchi, M., Grigoriev, A., Andersson, H., Gunell, H., Fedorov, A., ... Grande, M. (2008). Ionospheric photoelectrons at Venus: Initial observations by ASPERA-4 ELS. Planetary and Space Science, 56(6), 802-806. https://doi.org/10.1016/j.pss.2007.12.008

@article{c3a825824f184e4d99ded1790c5dfeee,

title = "Ionospheric photoelectrons at Venus: Initial observations by ASPERA-4 ELS",

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 nm 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 (ΔE/E∼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.",

keywords = "Venus, plasma, IONOSPHERE",

author = "Coates, {A. J.} and Frahm, {R. A.} and Linder, {D. R.} and Kataria, {D. O.} and Y. Soobiah and G. Collinson and Sharber, {J. R.} and Winningham, {J. D.} and Jeffers, {S. J.} and S. Barabash and Sauvaud, {J. A.} and R. Lundin and M. Holmstr{\"o}m and Y. Futaana and M. Yamauchi and A. Grigoriev and H. Andersson and H. Gunell and A. Fedorov and Thocaven, {J. -J.} and Zhang, {T. L.} and W. Baumjohann and E. Kallio and H. Koskinen and Kozyra, {J. U.} and Liemohn, {M. W.} and Y. Ma and A. Galli and P. Wurz and P. Bochsler and D. Brain and Roelof, {E. C.} and P. Brandt and N. Krupp and J. Woch and M. Fraenz and E. Dubinin and S. McKenna-Lawlor and S. Orsini and R. Cerulli-Irelli and A. Mura and A. Milillo and M. Maggi and Curtis, {C. C.} and Sandel, {B. R.} and Hsieh, {K. C.} and K. Szego and A. Asamura and M. Grande",

year = "2008",

month = may,

doi = "10.1016/j.pss.2007.12.008",

language = "English",

volume = "56",

pages = "802--806",

journal = "Planetary and Space Science",

issn = "0032-0633",

publisher = "Elsevier",

number = "6",

}

Coates, AJ, Frahm, RA, Linder, DR, Kataria, DO, Soobiah, Y, Collinson, G, Sharber, JR, Winningham, JD, Jeffers, SJ, Barabash, S, Sauvaud, JA, Lundin, R, Holmström, M, Futaana, Y, Yamauchi, M, Grigoriev, A, Andersson, H, Gunell, H, Fedorov, A, Thocaven, J-J, Zhang, TL, Baumjohann, W, Kallio, E, Koskinen, H, Kozyra, JU, Liemohn, MW, Ma, Y, Galli, A, Wurz, P, Bochsler, P, Brain, D, Roelof, EC, Brandt, P, Krupp, N, Woch, J, Fraenz, M, Dubinin, E, McKenna-Lawlor, S, Orsini, S, Cerulli-Irelli, R, Mura, A, Milillo, A, Maggi, M, Curtis, CC, Sandel, BR, Hsieh, KC, Szego, K, Asamura, A & Grande, M 2008, 'Ionospheric photoelectrons at Venus: Initial observations by ASPERA-4 ELS', Planetary and Space Science, vol. 56, no. 6, pp. 802-806. https://doi.org/10.1016/j.pss.2007.12.008

TY - JOUR

T1 - Ionospheric photoelectrons at Venus: Initial observations by ASPERA-4 ELS

AU - Coates, A. J.

AU - Frahm, R. A.

AU - Linder, D. R.

AU - Kataria, D. O.

AU - Soobiah, Y.

AU - Collinson, G.

AU - Sharber, J. R.

AU - Winningham, J. D.

AU - Jeffers, S. J.

AU - Barabash, S.

AU - Sauvaud, J. A.

AU - Lundin, R.

AU - Holmström, M.

AU - Futaana, Y.

AU - Yamauchi, M.

AU - Grigoriev, A.

AU - Andersson, H.

AU - Gunell, H.

AU - Fedorov, A.

AU - Thocaven, J. -J.

AU - Zhang, T. L.

AU - Baumjohann, W.

AU - Kallio, E.

AU - Koskinen, H.

AU - Kozyra, J. U.

AU - Liemohn, M. W.

AU - Ma, Y.

AU - Galli, A.

AU - Wurz, P.

AU - Bochsler, P.

AU - Brain, D.

AU - Roelof, E. C.

AU - Brandt, P.

AU - Krupp, N.

AU - Woch, J.

AU - Fraenz, M.

AU - Dubinin, E.

AU - McKenna-Lawlor, S.

AU - Orsini, S.

AU - Cerulli-Irelli, R.

AU - Mura, A.

AU - Milillo, A.

AU - Maggi, M.

AU - Curtis, C. C.

AU - Sandel, B. R.

AU - Hsieh, K. C.

AU - Szego, K.

AU - Asamura, A.

AU - Grande, M.

PY - 2008/5

Y1 - 2008/5

N2 - 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 nm 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 (ΔE/E∼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.

AB - 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 nm 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 (ΔE/E∼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.

KW - Venus

KW - plasma

KW - IONOSPHERE

UR - http://hdl.handle.net/2160/8324

U2 - 10.1016/j.pss.2007.12.008

DO - 10.1016/j.pss.2007.12.008

M3 - Article

SN - 0032-0633

VL - 56

SP - 802

EP - 806

JO - Planetary and Space Science

JF - Planetary and Space Science

IS - 6

ER -

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

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