Solar variability due to sunspots and faculae

Details Solar variability due to sunspots and faculae Solar variability due to sunspots and faculae

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..809c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Jan. 20, 1987, p. 809-812.

Physics

16

Faculae, Secular Variations, Sunspots, Irradiance, Limb Darkening, Solar Radiation

Scientific paper

Results of photometry of solar active regions and their effect on the solar irradiance in the visible part of the spectrum are presented. The effects of sunspots and faculae are given separately, since the measurement of sunspot irradiance fluctuations is less uncertain. It is argued that energy balance may exist between sunspot deficits and facular excesses. The uncertainty, however, is + or - 15 percent (1 sigma). This possible balance also depends on the correct mathematical model for the contrast of faculae as a function of position on the solar disk. Extreme Limb Photometer (ELP) data are presented in such a way as to show that the model for facular limb darkening is consistent with the assumptions inherent in the irradiance modeling. The ELP data support the notion that energy balance between spots and faculae is possible. It is emphasized that even if there is energy balance, there will still be variations in the solar irradiance at the earth.

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