Physics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980p%26ss...28.1003a&link_type=abstract
Planetary and Space Science, vol. 28, Oct. 1980, p. 1003-1009.
Physics
7
Atmospheric Models, Atmospheric Moisture, Ion Recombination, Mesopause, Nucleation, Water Vapor, Aerosols, Annual Variations, Electron Flux Density, Geomagnetism, Kinetic Energy, Magnetic Flux, Spatial Distribution, Water Temperature
Scientific paper
The possibility of aerosol formation at the mesopause by ion-induced water vapor nucleation is investigated. A simple kinetic model considering new information on ion-growth and ion-recombination processes as well as on mesospheric water vapor and temperatures is proposed. It predicts ion nucleation to be possible only at high latitudes during local summer in a narrow height region, extending from about 88 to 91 km. Derived nucleation rates increase steeply with decreasing temperatures and electron number densities. If, for the latter, typical values are considered, nucleation rates may become sufficiently high to account for the observed mesospheric aerosol layer. Various observed characteristic temporal and spatial variations of the aerosol layer including its response to geomagnetic activity may be explained by the model.
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