Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..365g&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Other
Scientific paper
A new 3D Monte-Carlo model was developed to trace produced hot particles through the thermosphere and exosphere, to study the expected asymmetries in the Venusian exospheric density. The newly photochemically generated energetic neutral atoms are traced from their point of origin up to the exobase. Due to more realistic treatment of the velocity distributions of electrons and ions the initial energies of the dissociative recombined atoms can be higher than the dedicated branching energies. Additional improvements of this code are the tracing in three dimensions as a function of altitude, latitude and longitude and the consideration of secondary and cascaded hot particles, which appearers after collision of the traced hot particle with an ambient constituent. Also the latest electron temperature dependent electron dissociative recombination coefficient and energy and mass dependent cross sections for elastic collisions are taken into account. An other feature is that the neutral atmosphere constituents are considered as moved and not at rest as most of the previous models. The hot particles which arrive at the exobase are divided into energy bins and used for the calculation of the energy density distributions as a function of latitude and longitude. These calculated energy density distributions of photochemically produced hot atoms at the Venusian exobase are used as inputs for 3D hot particle exosphere simulations. Finally we present results of hot and cold atomic oxygen particle populations in the Venus exosphere and compare these results with previous models.
Gröller Hannes
Kulikov Yu. N.
Lammer Helmut
Lichtenegger Herbert I. M.
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