A227-0007
The Effect of Sunspot Umbrae on the Total Solar Irradiance

Wednesday, 16 December 2020
Poster
Gary A Chapman, California State University Northridge, Northridge, CA, United States, Debi Prasad Choudhary, California St Univ Northrigde, Northridge, CA, United States and Angela M. Cookson, California State University, Northridge, San Fernando Observatory, Northridge, CA, United States
Abstract:
Most studies of the contribution of sunspots on the total solar irradiance (TSI) are based on the area of sunspots of constant average darkness. However, the average darkness (contrast) depends on the relative area of the umbra, the dark "core" of many sunspots. We will present results from a study of photometric observations, that measure the actual contrast of sunspots and their effect on TSI. This work is partially supported by NASA grant 80NSSC18K1328.
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