This plate illustrates four spectra from solar phenomena.
Spectrum 1 is Solar Spectrum and Spectrum of the Prominences, during a total Eclipse.
Spectrum 2 is Spectrum of the Corona. Observed by Charles Young (1834-1908).
Spectrum 3 is Spectrum of the Aurora Borealis. Observed by Joseph Winlock (1826-1875).
Spectrum 4 is Solar Spectrum and Spectrum of the Chromosphere.
Gustav Kirchhoff's scale is shown above.
Schellen, Heinrich. “Solar Spectra of Prominences, Corona, Aurora Borealis, and Chromosphere.” Spectrum Analysis in Its Application to Terrestrial Substances, and the Physical Constitution of the Heavenly Bodies. London, England: M. & N. Hanhart, 1872. https://digital.sciencehistory.org/works/2f75r906p.
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