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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 29, issue 1
Ann. Geophys., 29, 187-195, 2011
https://doi.org/10.5194/angeo-29-187-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 29, 187-195, 2011
https://doi.org/10.5194/angeo-29-187-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

  24 Jan 2011

24 Jan 2011

Comprehensive calculation of the energy per ion pair or W values for five major planetary upper atmospheres

C. Simon Wedlund1, G. Gronoff2, J. Lilensten3, H. Ménager3, and M. Barthélemy3 C. Simon Wedlund et al.
  • 1Belgian Institute for Space Aeronomy, BIRA-IASB, Brussels, Belgium
  • 2NASA Langley Research Center, Hampton, VA, USA
  • 3Institut de Planétologie et d'Astrophysique de Grenoble, IPAG, Grenoble, France

Abstract. The mean energy W expended in a collision of electrons with atmospheric gases is a useful parameter for fast aeronomy computations. Computing this parameter in transport kinetic models with experimental values can tell us more about the number of processes that have to be taken into account and the uncertainties of the models. We present here computations for several atmospheric gases of planetological interest (CO2, CO, N2, O2, O, CH4, H, He) using a family of multi-stream kinetic transport codes. Results for complete atmospheres for Venus, Earth, Mars, Jupiter and Titan are also shown for the first time. A simple method is derived to calculate W of gas mixtures from single-component gases and is conclusively checked against the W values of these planetary atmospheres. Discrepancies between experimental and theoretical values show where improvements can be made in the measurement of excitation and dissociation cross-sections of specific neutral species, such as CO2 and CO.

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