Abstract

Abstract : ;Contents: Initial survey and the organization of the spectroheliographic records of solar activity; Solar phenomena associated with polar cap absorption (PCA); Relative intensities of flare emission lines; Other research programs relating to flares; The small-scale structure of selected Fraunhofer lines; The decrease in intensity at the extreme solar limb; Investigations of center-to-limb variation of weak lines of iron and oxygen; The wavelengths of the lines in the solar spectrum; The chemical abundances in the solar atmosphere.

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