Time-dependent studies of the aurora - Effects of particle precipitation on the dynamic morphology of ionospheric and atmospheric properties

Details Time-dependent studies of the aurora - Effects of particle precipitation on the dynamic morphology of ionospheric and atmospheric properties Time-dependent studies of the aurora - Effects of particle precipitation on the dynamic morphology of ionospheric and atmospheric properties

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..991r&link_type=abstract

Planetary and Space Science, vol. 25, Nov. 1977, p. 991-1010.

Physics

9

Atmospheric Models, Auroras, Earth Ionosphere, Electron Precipitation, Time Dependence, Diurnal Variations, E Region, Electron Flux Density, F Region, Ionospheric Electron Density, Spectral Energy Distribution

Scientific paper

Roble's (1975) midlatitude diurnal model of the ionospheric F region is extended to include auroral processes and used to study the coupled time-dependent ionospheric and atmospheric processes associated with auroral events. Primary ionization rates and electron-production spectra due to aurorae are calculated and directly coupled into the secondary electron-transport portion of the ionospheric model; the coupled continuity equations include diffusion of the minor neutral constituents N (2D), N (4S), and NO. A series of numerical experiments is run with the auroral model to examine the time history of the coupled ionospheric/atmospheric response to direct auroral electron precipitation. The results show that: (1) the coupled response is dependent on the spectral energy distribution, flux magnitude, and time history of the precipitation; (2) soft-spectrum aurorae primarily affect the F region through variations in electron temperature, electron and ion density, and 6300-A airglow emission rate; (3) the ionospheric effects occur in both the E and F regions as the particle spectrum hardens; and (4) the ionospheric disturbances are virtually restricted to the E region for a hard-spectrum aurora with an average electron energy of 10 keV or greater.

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