Abstract
Eleven high-dispersion spectra of Venus, taken with blue Doppler shifts have enabled us to unmask the 7323.88 Å forbidden line of Ca ii from terrestrial absorption. We obtain an equivalent width of 7.4±0.4 mÅ for this line in integrated sunlight. Our value of W λ is smaller than previous values and much more accurate. The HSRA solar model gives a solar calcium abundance of A Ca = 6.21.
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Schorn, R.A., Young, A.T. & Barker, E.S. Forbidden Ca ii in the Sun unmasked by way of Venus. Sol Phys 43, 9–14 (1975). https://doi.org/10.1007/BF00155137
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DOI: https://doi.org/10.1007/BF00155137