Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988baicz..39..236s&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 39, July 1988, p. 236-242.
Astronomy and Astrophysics
Astronomy
7
Atmospheric Models, Photosphere, Sunspots, Umbras, Astronomical Photography, High Resolution, Solar Spectra, Spatial Distribution
Scientific paper
Semiempirical two-component models of 11 umbrae differing in size are presented and their general characteristics are discussed. The models, based on the profiles of the Fe I 543.5 nm and Na I D2 lines have bright components cooler than the undisturbed photosphere, with a temperature down-scaling factor Delta Theta = 0.10 in most cases. The temperature of dark components fluctuate in the range of Delta Theta = 0.35 to 0.50. The filling factor of the bright component remains practically constant in large umbrae whereas in small umbrae it changes considerably. No dependence of the temperature of both components as well as the filling factor on the phase of evolution of the spot was observed.
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