Other
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26..559w&link_type=abstract
Planetary and Space Science, vol. 26, June 1978, p. 559-569.
Other
3
Atmospheric Models, Computerized Simulation, F Region, Polar Regions, Annual Variations, Auroral Ionization, Daytime, Diurnal Variations, Electric Fields, Electron Precipitation, Ion Production Rates, Ionospheric Electron Density, Photoionization, Polar Caps, Recombination Reactions, Time Dependence
Scientific paper
Changes in F-region morphology i.e., electron density contours at an altitude of 300 km, are found to depend in the polar regions on variations in the asymmetry of global convective fields. No such changes, however, are noted for the mid-latitude ionospheric trough. Attention is given to the continuity equation for ionization density in a unit voulme as it moves across the polar cap and through the auroral zones, as modelled by numerical computer techniques. It is noted that the maximum densities occur when the geomagnetic pole is nearest the sun. Mechanisms of ionization are discussed, including chemical recombination and transport from the dayside of the auroral zone. The former is the dominant mechanism, although the latter assumes a special importance in winter, when no other mechanisms operate to maintain the polar cap ionosphere.
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