Solar variability due to sunspots and faculae
作者:
G. A. Chapman,
期刊:
Journal of Geophysical Research: Atmospheres
(WILEY Available online 1987)
卷期:
Volume 92,
issue D1
页码: 809-812
ISSN:0148-0227
年代: 1987
DOI:10.1029/JD092iD01p00809
数据来源: WILEY
摘要:
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 ±15% (1σ). 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 eart
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