Physics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8.1167b&link_type=abstract
Geophysical Research Letters, Vol. 8, Nov. 1981, p. 1167-1170. Heidelberg, West Germnay) Geophysical Research Letters, vol. 8, N
Physics
31
Ice Nuclei, Mass Spectroscopy, Mesopause, Noctilucent Clouds, Positive Ions, Summer, Arctic Regions, Condensing, Cooling, Hydrates, Ionospheric Composition, Ionospheric Electron Density, Molecular Weight, Particle Mass, Temperature Effects
Scientific paper
A positive ion composition measurement at the summer, high latitude mesopause in the presence of noctilucent clouds has been found to reveal the existence of very massive positive ionospheric ions. The ions were taken to be proton hydrates, the heaviest of which contained as many as 20 water molecules. The most massive ions were concentrated in a thin layer at an altitude of 90 km. To explain the existence of such heavy ionospheric ions, strong local cooling within the layer, in combination with a very low electron concentration, is proposed. Despite the high altitude at which the ions were detected, it is thought possible that they represent condensation nuclei eventually leading to the formation of visible noctilucent clouds.
Arnold Frank
Bjorn L. G.
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