Negative ion composition for different conditions in the mesosphere

Mathematics

Scientific paper

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Atmospheric Chemistry, Mathematical Models, Mesosphere, Negative Ions, Atmospheric Models, D Region, Heavy Ions, Ion Distribution, Solar Eclipses

Scientific paper

The negative ion composition in the altitude range 56 to 86 km was measured during the 1979 solar eclipse with a high resolution magnetic mass spectrometer. From these data an ion chemical model for negative ions in the D region was developed. The calculated profiles for 0-, O-2, Cl-, CO-3, HCO-3, NO-3 and CO-4 agree with the measurements. A great number of different heavy ions was measured. With the laboratory reaction rates for negative cluster ions, the model can not explain these heavy ions. The model was applied to conditions reported from the European Winter Anomaly Campaign 1976, The Noctilucent Cloud Campaign 1978 and from the Energy Budget Campaign 1980. Model calculations show very different negative ion compositions for different atmospheric conditions.

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