The chemistry of excited NO/+/ in an aurora

Physics

Scientific paper

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Atmospheric Chemistry, Auroras, Molecular Ions, Nitric Oxide, Reaction Kinetics, Altitude, Chemical Reactions, Electron Transitions, Positive Ions

Scientific paper

The six most significant production and seven most significant loss mechanisms are identified for NO(+)(a3 Sigma) in the aurora. Rate constants are given for these reactions as well as for the 14 most important reactions competing with the production of NO(+)(a). Using available data and certain crucial deductions on chemical reaction rates to simulate a number of altitude profiles, it is concluded that the two predominant sources of NO(+)(a3 Sigma) are probably N(+) + O2 yields NO(+)(a) + O and N2(+) + NO yields NO(+)(a) + N2. Radiative decay is not the primary loss mechanism but can dominate above 150 km. Destruction via charge exchange with N2 and O are most important below 150 km.

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