Abstract
The current knowledge on extraterrestrial solar irradiance at wavelengths larger than 200 nm is briefly reviewed, taking into account the recent UARS and ATLAS observations performed since the end of 1991. The uncertainties associated with these measurements are presented and the two average spectra obtained with the various instruments on board the two platforms are compared. Above 200 nm and, more specifically in the UV-B and UV-A ranges, solar irradiances are now available with an absolute accuracy better than ±5 percent and the differences between the two spectra do not exceed ±2 percent above 280 nm. The variability with the solar activity cycle is not detectable so far above 250 nm and should be less than 1 percent. A brief review on new MgII indices is also given.
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© 1997 Springer-Verlag Berlin Heidelberg
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Simon, P.C. (1997). Extraterrestrial Solar Irradiance in the Near and Medium UV Ranges. In: Zerefos, C.S., Bais, A.F. (eds) Solar Ultraviolet Radiation. NATO ASI Series, vol 52. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-03375-3_1
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DOI: https://doi.org/10.1007/978-3-662-03375-3_1
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