A surface chemistry model for the altitude dependence of the N2 Lyman-Birge-Hopfield glow on spacecraft

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Atmospheric Composition And Structure: Thermosphere-Composition And Chemistry

Scientific paper

Low-orbiting spacecraft have been observed to cause UV emission in the N2 Lyman-Birge-Hopfield bands. We examine the chemical processes expected to underlie this emission. Recombination between incident and adsorbed N atoms has been proposed as the source of radiating N*2 however, the cubic dependence of the intensity, as [N2]3 or [N2]2[O], has not been explained. We suggest that this can be explained by a model where adsorption of nitrogen on the spacecraft surface is balanced mainly by the removal of N from the surface by atomic oxygen. On the basis of these assumptions we construct a mathematical model for the production of N*2. We show that for large enough reaction efficiencies our model predicts a magnitude and altitude dependence for the emission which can explain the measurements reported by other investigators.

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