Fraunhofer spectrum and a system of solar oscillator strengths

Results of research concerned with the Fraunhofer spectrum of the sun and problems associated with this type of research are reviewed in a historical perspective. Solar dual-diffraction monochromators are described, and methods of observing the Fraunhofer spectrum with a high spectral resolution are discussed. Results of studies concerned with the development of solar oscillator forces, determined from the Fraunhofer lines, are reviewed. Oscillator force values are presented for 1958 spectral lines of 49 chemical elements in the wavelength range 303-996 nm.