Physics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29.1079g&link_type=abstract
Planetary and Space Science, vol. 29, Oct. 1981, p. 1079-1087.
Physics
38
Cloud Glaciation, Cloud Seeding, Ice Nuclei, Mesosphere, Noctilucent Clouds, Atmospheric Moisture, Atmospheric Pressure, Atmospheric Temperature, Crystal Growth, Free Energy, Particle Size Distribution, Water Vapor
Scientific paper
The existence of noctilucent clouds probably indicates that there are submicron ice crystals in the upper atmosphere at altitudes of 80-85 km. For ice crystals to form at all, the temperature in the cloud region must be very low. The pressure at these heights is such that the ice crystals have relatively large settling speeds and growth has to be rapid enough for the crystals to reach observable size before they drop clear of the saturated region. The mesosphere is thought to be rather dry, with water vapor mixing ratios of a few parts per million only and it becomes difficult to envisage conditions where the growth rate is large enough to give crystals of observable size. In this paper, the results of numerical calculations of crystal sizes are discussed to provide a guide to the interpretation of observational data.
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