Abstract
A new series of photometric observations of the H and K lines were obtained at Sacramento Peak Observatory in 1964 and 1965. In both the observations and the data reduction special attention was given to obtaining a suitable average over the solar fine structure and to defining a proper reference continuum. The results are that the central intensities of H and K are the same and equal to 4.2% of the continuum. The limb-darkening curves at the line centres are also the same for both lines.
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White, O.R., Suemoto, Z. A measurement of the solar H and K profiles. Sol Phys 3, 523–530 (1968). https://doi.org/10.1007/BF00151934
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DOI: https://doi.org/10.1007/BF00151934