Monte-Carlo modelling of hot particles in Venus upper atmosphere

Details Monte-Carlo modelling of hot particles in Venus upper atmosphere Monte-Carlo modelling of hot particles in Venus upper atmosphere

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010eguga..1211643g&link_type=abstract

EGU General Assembly 2010, held 2-7 May, 2010 in Vienna, Austria, p.11643

Physics

Scientific paper

Suprathermal oxygen atoms produced by means of photochemical reactions in planetary thermospheres can play an important role for the escape of atmospheric species by direct (i.e. thermal) or indirect (e.g. pick up) processes. In either case the non-thermal energy distribution functions at the exobase must be known in order to estimate the hot oxygen exosphere density profiles. For this purpose hot particles generated via dissociative recombination of O2+ are traced along their stochastic way through the thermosphere of Venus by using a 3D Monte-Carlo model and the kinetics and transport characteristics of these particles are determined. The simulation considers the collision of the suprathermal particles with the background gas, energy transfer, and the tracing of secondary and cascaded hot atoms, which are generated in collisions of the hot particles with ambient constituents. A non-linear electron dissociative recombination coefficient as well as energy and mass dependent collision cross sections and their corresponding scattering angles (forward scattering) are also taken into account. The exosphere density is obtained from the corresponding energy density and angular distribution at the exobase altitude by using a test particle model which traces the ballistic trajectories of hot O atoms in the exosphere.

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