Hot oxygen atoms in the Venus nightside exosphere - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Geophysical Research Letters Year : 2012

Hot oxygen atoms in the Venus nightside exosphere

H. Gröller
  • Function : Author
H. Lammer
  • Function : Author
H. I. M. Lichtenegger
  • Function : Author
M. Pfleger
  • Function : Author
V. I. Shematovich
  • Function : Author
Y. N. Kulikov
  • Function : Author
H. K. Biernat
  • Function : Author


The nightside oxygen exosphere of Venus is investigated for high and moderate solar activity by means of a Monte-Carlo model. Hot O atoms are assumed to be produced by dissociative recombination of O2+ and NO+ molecular ions and by charge transfer processes between ionospheric O+ ions and neutral O and H atoms. The model considers rotational and vibrational excitation of the initial energy distribution of hot O atoms, includes elastic, inelastic, and quenching collisions between the suprathermal atoms and the ambient neutral atmosphere species, and uses differential cross sections for the determination of the scattering angle in the collisions. The results indicate that dissociative recombination of O2+ is, like at Venus' dayside, the most efficient source of hot O atoms at the planet's nightside. For high solar activity, the nightside exospheric density of hot O atoms is about one order of magnitude lower compared to the dayside, although between 2-10 times higher than in previous studies.
Fichier principal
Vignette du fichier
Geophysical Research Letters - 2012 - Gr ller - Hot oxygen atoms in the Venus nightside exosphere.pdf (420.24 Ko) Télécharger le fichier
Origin Publisher files allowed on an open archive

Dates and versions

insu-03612450 , version 1 (18-03-2022)





H. Gröller, H. Lammer, H. I. M. Lichtenegger, M. Pfleger, O. Dutuit, et al.. Hot oxygen atoms in the Venus nightside exosphere. Geophysical Research Letters, 2012, 39, ⟨10.1029/2011GL050421⟩. ⟨insu-03612450⟩
20 View
8 Download



Gmail Mastodon Facebook X LinkedIn More