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Originally Posted by naskies
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No....it's the generalised green glow he's talking about. If it's not some refraction effect through very fine mist, then it maybe light coming from ionised oxygen atoms....specifically from the transition of outer valence shell electrons back into their ground state, giving you that green coloured light. It'll be occurring in the upper atmosphere...very high up, over 100km up. It's probably being generated by the sprites and other electrical discharges at the tops of the storms.