Abstract
BY means of a new spectrograph, constructed by J. Cojan at the Société Générale d'Optique, Paris, combining the high light power F : 0.65 with a fairly good dispersion, four spectrograms were taken at the Auroral Observatory, Tromsoe, on December 3, 1951, at about 23h. 00m. The spectrograms were taken on Kodak 103a-T plates and in rapid succession on the same plate with times of exposures from 4 to 10 min.
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VEGARD, L. Great Intensity Variations of Hα and Effects in Auroral Spectrograms taken in Rapid Succession. Nature 170, 536–537 (1952). https://doi.org/10.1038/170536a0
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DOI: https://doi.org/10.1038/170536a0
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