On the umbra-penumbra area ratio of sunspots

Details On the umbra-penumbra area ratio of sunspots On the umbra-penumbra area ratio of sunspots

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..129..191b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 129, Sept. 1990, p. 191-194. Research supported by DFG.

Physics

24

Penumbras, Solar Activity Effects, Sunspot Cycle, Umbras, Faculae, Solar Radiation

Scientific paper

The area ratio of umbra to penumbra A(u)/A(p) was investigated for a series of 126 sunspots observed around the maximum of solar activity in 1980. Plotting log A(u) as a function of log A(p), a linear relation is obtained, with a slope of 1.10, yielding an average ratio A(u)/A(p) of 0.24 for small spots and of 0.32 for large spots. This deviates noticeably from the commonly adopted constant value of A(u)/A(p) = 0.21 used for modeling the sunspot irradiance deficit from the Solar Geophysical Data

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