Variations in the solar constant due to solar active regions

Details Variations in the solar constant due to solar active regions Variations in the solar constant due to solar active regions

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242l..45c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 242, Nov. 15, 1980, p. L45-L48.

Astronomy and Astrophysics

Astrophysics

35

Faculae, Solar Activity Effects, Solar Constant, Sunspots, Brightness, Data Reduction, Limb Darkening, Stellar Luminosity

Scientific paper

Solar activity is expected to affect the solar constant at some level. Recent observations and data analysis show the amount of variation to be expected for active regions, faculae, and sunspots on the apparent solar brightness. It is concluded that the maximum effect is about 20 times greater for sunspots than for faculae per unit area. Because facular areas are 25-30 times those for sunspots, the effect on the solar constant of faculae and sunspots is approximately equal and opposite, being typically in the neighborhood of 40-100 parts per million (ppm), but on occasion able to reach over 200 ppm. The issue of energy balance is not discussed here, for it requires further data analysis as well as information on the facular and sunspot limb darkening.

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