Implications of dissociative recombined hot atoms for the atmospheric escape of lower mass planets

Details Implications of dissociative recombined hot atoms for the atmospheric escape of lower mass planets Implications of dissociative recombined hot atoms for the atmospheric escape of lower mass planets

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..833g&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Computer Science

Scientific paper

ABSTRACT Lower energetic neutral atoms which are produced due to photochemically reactions in planetary thermospheres play an important role for the escape of atmospheric species at lower mass planets, like Mars. For tracing energetic neutral atoms which are produced in the thermospheres and for the calculation of their non-Maxwellian-type energy density distribution we applied a Monte-Carlo code. The newly photochemically generated energetic neutral atoms, e.g., O, H, N, C, CO, are traced from their point of origin up to the exobase. The applied code considers collisions, direction changes, energy transfer, the tracing of secondary and cascaded hot atoms, which are generated after collision of the traced hot particles with ambient constituents. Non-linear electron dissociative recombination coefficient and energy and mass dependent collision cross sections are taken into account. 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. From these distributions, particles with energies higher than the escape energy are lost from the planet. Finally we compare the loss rates of lower mass Martian-size planets with Earth-like planets.

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