Abstract
SPECTRA obtained at Saskatoon during the summer of 1955 showed sharp emission lines of wave-lengths 3933.8 A. and 3968.4 A. ±; 0.2 A. to be present at times in the twilight. The spectra were obtained with two Schmidt spectrographs of dispersion 20 A./mm. and 10 A./mm. A microphotometer tracing of a twilight plate obtained on July 14 is shown in Fig. 1.
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References
“M.I.T. Wavelength Tables” (Wiley, New York, 1939).
Lovell, A. C. B., “Meteor Astronomy”, 391 (Oxford Univ. Press, 1954).
Hunten, D. M., Roach, F. E., and Chamberlain, J. W., J. Atmos. Terr. Phys. (in the press).
Hunten, D. M., J. Atmos. Terr. Phys., 5, 44 (1954).
Baum, W. A., and Dunkelman, L., J. Opt. Soc. Amer., 45, 166 (1955).
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JONES, A. Ca II Emission Lines in the Twilight Spectrum. Nature 178, 276–277 (1956). https://doi.org/10.1038/178276a0
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DOI: https://doi.org/10.1038/178276a0
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