Physics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987angeo...5..369r&link_type=abstract
(URSI and High Altitude Observatory, International Symposium on Large-Scale Processes in the Ionospheric-Thermospheric System, B
Physics
54
Atmospheric Circulation, Atmospheric Models, Auroral Ionization, Particle Precipitation, Thermosphere, Ion Production Rates, Ionospheric Ion Density
Scientific paper
A model of high latitude auroral processes has been developed for use in the NCAR TGCM. The ion drift pattern associated with magnetospheric convection is specified by the empirical model of Heelis et al. (1982) considering offset geographic and geomagnetic poles. An analytic prescription of particle precipitation in the auroral oval is developed that enables rapid numerical evaluation of auroral ionization rates and global aurora power input. An analytic expression has been derived for the total ionization rate and an ion chemical scheme is used to calculate the electron density enhancements and ion density distributions caused by auroral particle precipitation. The results of TGCM runs with and without auroral particle precipitation show the importance of auroral ionization in determining the dynamic structure of the winter hemisphere lower thermosphere.
Ridley E. C.
Roble Raymond G.
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