Abstract
The assumptions of pure absorption and local thermodynamic equilibrium are sometimes used to calculate approximate spectral line profiles in cases where a rigorous treatment is impractical or impossible. In certain conditions, the profile is not completely defined under these assumptions.
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This work was done under NASA contract No. NAS8-26376 for the Space Sciences Laboratory, George C. Marshall Space Flight Center, Huntsville, Ala.
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Dunn, A.R. Calculation of 5250.216 Å line profiles in sunspots. Sol Phys 26, 83–86 (1972). https://doi.org/10.1007/BF00155107
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DOI: https://doi.org/10.1007/BF00155107