The importance of new chemical sources for the hot oxygen geocorona
Gérard, J. C.; Richards, P. G.; Shematovich, V. I.; Bisikalo, D. V.; Gérard, J. C.; LPAP, Institut d'Ástrophysique, Universite de Liège, Belgium; Richards, P. G.; Center for Space Plasma and Aeronomic Research, The University of Alabama in Huntsville, USA; Shematovich, V. I.; Institute of Astronomy of the Academy of Sciences, Moscow, Russia; Bisikalo, D. V.; Institute of Astronomy of the Academy of Sciences, Moscow, Russia
Журнал:
Geophysical Research Letters
Дата:
1995
Аннотация:
Exothermic reactions involving metastable neutrals and ions were recently proposed as sources of hot oxygen atoms in addition to the classical O<sub>2</sub><sup>+</sup> and NO<sup>+</sup> dissociative recombination. The Boltzmann equations for thermal and nonthermal populations of O atoms are solved with a Monte Carlo stochastic simulation method. It is shown that the calculated energy distribution functions of O atoms are significantly in nonequilibrium in the transition region between the thermosphere and the exosphere. It is found that the inclusion of additional sources leads to stronger disturbances of the energy distribution function and, as a consequence, increases the nonthermal fraction of hot O atoms. The variation of the vertical distribution of hot O between solar maximum and minimum conditions is also evaluated and shows good agreement with the available experimental evidence.
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