An experimental and theoretical study of the mean diurnal variation of O/+/, NO/+/, O2/+/, and N2/+/ ions in the mid-latitude F1 layer of the ionosphere

Physics

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Diurnal Variations, F Region, Midlatitude Atmosphere, Molecular Ions, Photochemical Reactions, Positive Ions, Atmospheric Chemistry, Atmospheric Composition, Electron Energy, Explorer Satellites, Ion Temperature, Mean, Nitric Oxide, Nitrogen Ions, Oxygen Ions, Satellite-Borne Instruments

Scientific paper

A theoretical model of the diurnal variations in the compositions of the ions O(+), NO(+), O2(+) and N2(+) in the midlatitude F1 layer is presented and compared with measurements made by AE-C. The theoretical model includes the rate coefficients and branching ratios for the dissociative recombination of NO(+), O2(+) and N2(+) with electrons and the ion-atom interchanges of O(+) with N2 and N2(+) with O. Input parameters to the model comprise measurements of ion and electron temperatures, neutral atmosphere composition, the solar EUV flux and the photoelectron spectrum. In general, model calculations are found to agree with satellite measurements, confirming the major ion sources and sinks of the photochemical model, which has an accuracy of + or - 60%.

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