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We describe a large enhancement of the O2(¹Δg - ³Σg), infrared oxygen band at 1.27 µ in <IBC II auroras. A comparison with N2+ band intensity suggests that the O2 emission is too strong to be sustained by the electron flux responsible for N2+. Alternative sources of energy, such as chemical reactions and electric fields, are considered.
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J. F. Noxon (1970) studied this question.
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