The differential flux of secondary electrons with energy greater than 6 e V w a s measured in a steady I aurora with an electron spectrometer aboard an Aerobee rocket.range 10-20 eV, the observed spectrum is in excellent agreement with a recent theoretical prediction.About one-half of the observed N2+ emission at 3914 A can be accounted for by secondary electron excitation.Except for the absence of structure in the energy
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Feldman et al. (1971) studied this question.