Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.4061k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A4, April 1, 1992, p. 4061-4072.
Physics
11
Auroral Zones, F Region, Ion Distribution, Ionospheric Ion Density, Oxygen Ions, Velocity Distribution, Collision Rates, Distribution Functions, Ionic Collisions
Scientific paper
An expression is proposed for the O(+) atomic oxygen ion velocity distribution in the upper part of the auroral F layer when the ions are subjected to an intense convection electric field under the assumption that this layer is made up of neutral O atomic oxygen and atomic O(+) ions. The Boltzmann equation with a modified relaxation collision term is used to obtain the O(+) ion velocity distribution function. The non-Maxwellian ion distribution function is obtained as a linear combination of a toroidal anisotropic contribution and of a Maxwellian isotropic contribution. The coefficients of this linear combination depend on the ion-neutral and ion-ion collision frequencies nu(ii) and nu(in). The expressions and values of these two frequencies are calculated self-consistently. The nu(ii)/nu(in) ratio is found to increase when the electric field increases; this ratio is greater in the present model than for the Maxwellian steady state.
Hubert Daan
Kinzelin E.
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