Heavy ionospheric ions in the formation process of noctilucent clouds

Details Heavy ionospheric ions in the formation process of noctilucent clouds Heavy ionospheric ions in the formation process of noctilucent clouds

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.7985b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Aug. 20, 1985, p. 7985-7998. Research supported by the Swedish Board

Physics

38

Atmospheric Chemistry, Condensation Nuclei, Heavy Ions, Ionospheric Ion Density, Mesopause, Noctilucent Clouds, Arctic Regions, Hydrates, Negative Ions, Nitric Oxide, Plasma Density, Positive Ions, Temperature Profiles, Vertical Air Currents

Scientific paper

The noctilucent clouds (NLC) represent a unique feature of the summer night sky at higher latitudes. The clouds exist only in the mesopause region at altitudes of about 80 to 86 km and are composed of small particles which, because of the high altitude, are sunlit long after the sunset at ground level. Starting with a study conducted by Smyth (1886), the NLC have been extensively investigated. However, many questions are still unsolved. The possibility has been considered that large ionospheric ions can act as condensation nuclei in connection with the formation process of the NLC. Witt (1969) suggested proton hydrates as the most probable family of ions to grow to large sizes. In the present work, further evidence regarding proton hydrates is presented. In order to study ion chemistry and the possible role of ion-induced nucleation in the formation process of visible NLC, a rocket campaign was carried out at Esrange during July-August 1978. Some of the obtained results are discussed.

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