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Theoretical Line Profiles for Hydrogen and Calcium under Chromospheric Conditions

  • R. B. T. Black (a1)


Recent high resolution Ha photographs by Bray and Loughhead (unpublished) have confirmed that much of the chromosphere is quite non-uniform. Rather, it appears to consist of many distinct structures, which have a typical transverse section of several seconds of arc, i.e. about 2000 km.

The aim of the research reported in this contribution is to attempt to analyse the non-uniform chromosphere by first investigating a single structure. A simple model of a structure was chosen. From the model, line profiles of Hα and the H and K lines of Can were computed assuming a variety of physical conditions to exist in the feature.



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1 Giovanelli, R. G., Aust. J. Phys., 20, 81 (1967).
2 Black, R. B. T., Aust. J. Phys., 20, 271 (1967).
3 White, R. O., Astrophys. J. Supp., 7, 333 (1962).
4 Sheeley, N. R., Astrophys. J., 147, 1106 (1967).


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