A study of the contrast of sunspots from photometric images

Details A study of the contrast of sunspots from photometric images A study of the contrast of sunspots from photometric images

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..146...49b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 146, no. 1, p. 49-60.

Physics

22

Astronomical Photometry, Image Analysis, Image Contrast, Sunspots, Penumbras, Regression Analysis, Spectroheliographs, Stellar Models, Umbras

Scientific paper

The thermal contrast alpha, and the umbra-penumbra A(u)/A(p) were calculated for 63 sunspots of various sizes and morphologies. Results show that values of alpha ranged from 0.1807 to 0.4266 and A(u)/A(p) ranged from 0.0089 to 0.4899. The values of thermal contrast and umbra-penumbra were compared with complexity ratings, magnetic field strength, and time factors and found to be independent of these parameters.

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