Physics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..105...27a&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 105, May 1986, p. 27-33.
Physics
3
Photosphere, Sunspots, Isophotes, Penumbras, Stellar Structure, Umbras
Scientific paper
Preliminary results of a study of photographic and photometric properties of the large-scale structure of a sunspot and its surrounding photosphere are given. Stratospheric direct frames of the solar photosphere were used in the study. Isophotes located immediately beyond the outer edge of the penumbra were of an irregular form and reflected bright and dark regions. No presence of either a sunspot bright outer ring or inner ring was detected. The photospheric structure and its behavior with time were, in fact, unchanged up to the very boundary of the penumbra. A distribution of the smeared intensity in a sunspot has been derived. The mean brightness of the penumbra is 0.62 the solar brightness; the mean brightness of the umbra is less than 0.15 the solar brightness. An analysis of the obtained results leads to the conclusion that the area of the dark penumbral regions exceeds that of the bright penumbral regions, and the condition S(BR)/SDR less than 1 should be fulfilled in the penumbrae of sunspots.
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