Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975azh....52..553s&link_type=abstract
Astronomicheskii Zhurnal, vol. 52, May-June 1975, p. 553-560. In Russian.
Astronomy and Astrophysics
Astronomy
Absorption Spectra, Fine Structure, Line Spectra, Solar Spectra, Spectrum Analysis, Absorptivity, Emission Spectra, Solar Atmosphere
Scientific paper
A method is proposed which makes use of closely located triplet lines occurring from a common lower level or from lower sublevels with small energy difference. It is assumed that both the source function in a line and the frequency dependence of the selective absorption coefficient are identical at any depth of the region of line formation in the atmosphere and vary identically with this depth. Initial data are the residual intensities of the separate lines of a triplet, measured for each line at several profile points equidistant from the line center and at different distances from the center of the solar disk. Two formulas are provided to calculate the source function in a line and its long-wave dependence inside the line, to construct a model of the solar atmosphere, to evaluate the ratio between the selective and continuous coefficients of absorption, and to determine the long-wave dependences of the coefficients of both selective absorption and selective emission at various optical depths. One of these formulas is applicable to doublet lines without recourse to a model.
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