Abstract
The wavelengths of 142 solar absorption lines, in light taken from the center of the solar disk, and in the wavelength region 4675 Å to 6275 Å, have been determined by interferometric comparison with the standard wavelengths of Hg198. A Fabry-Pérot interferometer was crossed with a high dispersion, Wadsworth type spectrograph by a method similar to that used at Allegheny and Mount Wilson Observatories in the original determinations of the IAU solar wavelength standards of 1928. The wavelengths of 68 solar iron lines are compared with hollow cathode wavelengths, and differences between the resulting wavelength shift and that predicted by relativity theory calculated.
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This research represents work done in partial fulfillment of the requirements for a doctorate at Georgetown University and with support from the National Science Foundation under NSF GP-4682.
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O'Brien, J.E. Interferometric measurements of 142 solar wavelengths. Sol Phys 19, 314–322 (1971). https://doi.org/10.1007/BF00146059
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DOI: https://doi.org/10.1007/BF00146059