An analysis of the resonance lines of nine elements (27 ions) formed in the chromosphere and corona of the sun yields the following results: (a) the chemical composition of this region of the sun can be determined, without any knowledge of the detailed temperature-density structure in this region; (b) a further clue concerning the detailed structure of this region may be obtained. A prediction of the expected emission of the sun in radio frequencies can be used both as a check on the correctness of the present work and as a means of obtaining the ratio of the observed elements to hydrogen.
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S. R. Pottasch (1963) studied this question.