Abstract
Rocket measurements of the differential photoelectron flux and the volume emission rate of the N 2(0, 0) second positive band are used to calculate the daytime concentration of metastable A 3σ u + molecules, and consequently the resonance scattering contribution to the N 2 first positive emission in the dayglow. The dominant source of N 2 first positive emission is found to be photoelectron impact, with resonance scattering contributing only 10–20 per cent the total emission.
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