Abstract
WHILE carrying out research on the elements of rare earths in sunspots, I happened to notice some lines in a photograph taken at the Arcetri solar tower by Prof. G. Abetti which, so far as I know, have not been hitherto identified. These lines, which were relatively intense in the spots, and very faint, or entirely absent in the photosphere, may be attributed to the secondary spectrum of hydrogen, that is, to the molecular spectrum.
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PICCARDI, G. Molecular Hydrogen in Sunspots. Nature 122, 880 (1928). https://doi.org/10.1038/122880a0
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DOI: https://doi.org/10.1038/122880a0
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