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Ca II Emission Lines in the Twilight Spectrum

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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

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Authors and Affiliations

  1. Physics Department, University of Saskatchewan, Saskatoon, Sask.

    A. VALLANCE JONES

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  1. A. VALLANCE JONES
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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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