Improved data of solar spectral irradiance from 0.33 to 1.25 microns

Physics

Scientific paper

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93

Irradiance, Line Spectra, Solar Limb, Solar Radiation, Solar Spectra, Absorption Spectra, Fraunhofer Lines, H Lines, Random Errors, Solar Constant

Scientific paper

The conversion of center-of-disk intensities (Neckel and Labs, 1968, 1970) into mean disk intensities has been repeated, using more accurate data for the center-to-limb variation of both continuous radiation and strong absorption lines. The random observational mean error of the new irradiance data is very likely not larger than 1.5% in the UV and not larger than 1% in the visible and infrared. Comparison with the fluxes of sun-like stars observed by Hardorp (1980) confirms these errors and seems to exclude the possibility of a systematic, wavelength-dependent scale error which would correspond to a temperature difference larger than 50 K. The resulting integral value of the irradiance between 0.33 and 1.25 microns is 1.060; the corresponding value of the solar constant lies between 1.368 and 1.377 kW/sq m.

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