An estimate of changes in the sun's total irradiance caused by UV irradiance variations from 1874 to 1988

Details An estimate of changes in the sun's total irradiance caused by UV irradiance variations from 1874 to 1988 An estimate of changes in the sun's total irradiance caused by UV irradiance variations from 1874 to 1988

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3086...35l&link_type=abstract

In NASA, Goddard Space Flight Center, Climate Impact of Solar Variability p 35-41 (SEE N91-12456 03-92)

Physics

Earth Atmosphere, Faculae, Irradiance, Solar Activity Effects, Solar Cycles, Solar Radiation, Spectral Emission, Sun, Estimating, Sunspots

Scientific paper

Enhanced emission from bright solar faculae is a source of significant variation in the sun's total irradiance. Relative to the emission from the quiet sun, facular emission is known to be considerably greater at UV wavelengths than at visible wavelengths. Determining the spectral dependence of facular emission is of interest for the physical insight this may provide to the origin of the sun's irradiance variations. It is also of interest because solar radiation at lambda less than 300 nm is almost totally absorbed in the Earth's atmosphere. Depending on the magnitude of the UV irradiance variations, changes in the sun's irradiance that penetrates to the Earth's surface may not be equivalent to total irradiance variations measured above the Earth's atmosphere. Using an empirical model of total irradiance variations which accounts separately for changes caused by bright faculae from those associated with dark sunspots, the contribution of UV irradiance variations to changes in the sun's total irradiance is estimated during solar cycles 12 to 21.

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