Abstract
Thomas. The equation used by Seaton for the emission in the UV lines actually has implicit in it two assumptions not mentioned by Seaton. The equation assumes that each collisional excitation results in a photon escaping from the atmosphere in that transition. This is true only if: (1) the atom is a two-level atom; i.e. the transition considered may be so represented; (2) either (a) no radiation field builds up in the line, or (b) if a radiation field builds up, the atmosphere is symmetric about its mid-plane so the same emission escapes from both top and bottom. Both these assumptions must be checked in detail. Charlotte Pecker and I had tried to investigate both in some circumstances (Astrophys. J. 1963) but the work is only exploratory. However one should realize that he makes these assumptions, when he asks the validity of his results.
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References
Allen, C. W. and Corliss, C. H.: 1963, Mon. Not. Roy. Astron. Soc. 126, 37.
Garstang, R. H.: 1962a, Ann. Astrophys. 25, 109.
Garstang, R. H.: 1962b, Comm. Univ. London Obs. 57.
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Lüst, R., Faulkner, D.J., De Groot, M. (1965). Discussion on the Corona. In: De Jager, C. (eds) The Solar Spectrum. Astrophysics and Space Science Library, vol 2 . Springer, Dordrecht. https://doi.org/10.1007/978-94-017-6376-9_17
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DOI: https://doi.org/10.1007/978-94-017-6376-9_17
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