Abstract
Highly resolved photographs of 25 sunspots and pores of different areas in 2 continuous wavelengths, obtained in summer 1966 at the Sacramento Peak Observatory, have been used to reinvestigate the dependence of sunspot minimum intensity on area. Special care was taken to correct for parasitic light caused by blurring or image motion and by light scattering in the instrument and atmosphere. We find a very small, if any, dependence ofI min on sunspot area in contradiction to older measurements but in agreement with Sitnik's and Zwaan's statements.
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Rossbach, M., Schröter, E.H. On the dependence of sunspot minimum intensity on area. Sol Phys 12, 95–100 (1970). https://doi.org/10.1007/BF02276568
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DOI: https://doi.org/10.1007/BF02276568