Emission of the NO γ(1,0) band at 2150 A has been observed by a rocket‐borne spectrophotometer in an IBC II + aurora. The v'=0 progression of the γ‐system does not appear in the spectrum. The observed emission rate of the 2150 A feature increases relative to N 2 + first negative band emission with increasing altitude. We suggest radiative recombination of NO + ions with electrons as a possible excitation mechanism compatible with the data.
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P. D. Feldman (1976) studied this question.
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