Abstract
The Fraunhofer absorption lines for potassium and sodium on the Sun are compared with the corresponding lines in the laboratory using a resonant optical scattering method. The observed shifts between the Sun and laboratory lines may be interpreted in terms of the gravitational redshift (GRS), motion of the laboratory relative to the Sun and oscillatory terms which may be related to oscillations of the Sun.
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Brookes, J., Isaak, G. & van der Raay, H. Observation of free oscillations of the Sun. Nature 259, 92–95 (1976). https://doi.org/10.1038/259092a0
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DOI: https://doi.org/10.1038/259092a0
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