On the importance of the stochastic character of radiation pressure in exospheric modelling

Details On the importance of the stochastic character of radiation pressure in exospheric modelling On the importance of the stochastic character of radiation pressure in exospheric modelling

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..150b&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 2-3, p. 150-159.

Other

Atmospheric Models, Exosphere, Particle Trajectories, Radiation Pressure, Hydrogen Atoms, Lyman Alpha Radiation, Monte Carlo Method, Stochastic Processes

Scientific paper

The influence of the stochastic character of Lyman-alpha radiation pressure upon hydrogen atoms in the upper geocorona is studied on the basis of a Monte Carlo modeling of atomic trajectories. The right way of calculating mean (bound) orbits is by averaging the positions of atoms taken for given (preselected) osculating orbital phases, because simple averaging gives erroneous results. Density distributions created by beams of atoms launched under identical initial conditions in the middle and upper exosphere are appreciably diluted in comparison with 'crisp' patterns given by atoms tracked in the ('classic') continuous radiation pressure case. Particular care is needed when modelling the upper geocorona, where the escape rate of atoms may need recalculation due to the stochastic character of radiation pressure: in some cases particles launched under identical initial conditions may leave the geocorona, while others reenter the exobase. The need to use a Monte Carlo scheme in exospheric modeling is discussed. A simple criterion of employing the stochastic scheme to track exospheric atoms - to account for the stochastic character of the radiation pressure in Monte Carlo exospheric modelling - is offered.

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