Abstract
ONE of the most striking characteristics of both auroral and night-sky spectra is the absence of hydrogen lines. So far as I am aware, not even a trace of the atomic or molecular spectra of hydrogen has ever been observed in either of the above spectra. The question is immediately raised, does this absence prove that there is no hydrogen in the upper atmosphere at the heights at which night-sky and auroral spectra have been photographed? It is the purpose of this note to discuss briefly the answer to this question.
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KAPLAN, J. Hydrogen in the Upper Atmosphere. Nature 136, 549–550 (1935). https://doi.org/10.1038/136549a0
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DOI: https://doi.org/10.1038/136549a0
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