Abstract
The presence of the Lyman-alpha line in emission across the whole disk of the Sun suggests that the chromosphere is excited by a mechanism additional to that given by the absorption of photospheric radiation. To find some of the properties of this additional excitation the observed intensity of a chromospheric line, as observed at the limb of the Sun outside an eclipse, is derived as an integral containing the source function. A numerical method of solving this integral equation is outlined, and from the solution the excitatio temperature and the density can be found as functions of radial height in the chromosphere. Other applications of the integral equation are briefly discussed.
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