Determination of the sources and sinks of N/+/ ions in the thermosphere

Physics

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Gas Ionization, Ion Sources, Nitrogen Ions, Thermosphere, Atmospheric Chemistry, Explorer 51 Satellite, Helium, Photodissociation, Vertical Distribution

Scientific paper

Measurements of atmospheric parameters made by the Atmosphere Explorer-C satellite used to identify mechanisms for the production and loss of N(+) ions in the ionosphere are presented. Photo-dissociative ionization of N2 is the main source below 250 km. Above 250 km the reaction O(+)(4S) + N(2D) yields N(+)(3P) + O(3P) is dominant, and a possible minor source of N(+) is the reaction O(+)(2P) + N2 yields N(+) + NO. Photoionization of N(4S) and dissociative charge exchange of He(+) with N2 constitute detectable sources above 350 km. Charge exchange of N(+) with O is a significant sink above 300 km, and the rate coefficients for these reactions are derived.

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