Blue Sunlit Aurora Rays and their Spectrum

Details Blue Sunlit Aurora Rays and their Spectrum Blue Sunlit Aurora Rays and their Spectrum

Dec 1938

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1938natur.142.1034s&link_type=abstract

Nature, Volume 142, Issue 3606, pp. 1034 (1938).

Physics

3

Scientific paper

IN the morning of September 15 last, between 3h and 4h M.E.T. (sunrise in Oslo, 5h45m), blue sunlit aurora rays were observed, like those of March 23, 19201. Simultaneous photographs from two stations showed that the blue part was lying from about 250 km. to 650 km. above the earth. We succeeded in taking some good spectra which were very similar to a most interesting spectrum taken by Lord Rayleigh2 of the aurora of May 14, 1921. In Fig. 1 is seen the spectrum taken on Agfa Isopan plate ISS, exposure from 2h35m to 3h55m, of the summits of sunlit aurora rays among which the greater part were blue. The small spectrograph used was loaned by the Auroral Observatory in Tromsö. The wave-lengths have been measured by Dr. Harang and are written above the spectrum.

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