Abstract
ON Mar. 15 last I received information from the State Telegraphic Department that earth currents were disturbing the telegraphic service. Believing that we should have an aurora in the evening, I warned my four photographic stations, Oslo, Kongsberg, Tömte, and Oscarsborg, to be ready for action immediately after sunset. Using the excellent type of direct vision spectroscope described by Lord Rayleigh,1 I was able to localise an aurora arc in the northern sky during the twilight, long before it was possible to distinguish it visually.
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References
"On Visual Observations of the Aurora Line in the Spectrum of the Sky at Night", Gerlands Beiträge zur Geophysik, vol. 19, pp. 292–297.
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STÖRMER, C. New Evidence of the Action of Sunlight on Aurora Rays. Nature 123, 868–869 (1929). https://doi.org/10.1038/123868a0
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DOI: https://doi.org/10.1038/123868a0
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