Abstract
Fourteen years (November 16, 1978 through January 24, 1993) of Nimbus-7 total solar irradiance measurements have been made. The measured mean annual solar energy just outside of the Earth's atmosphere was about 0.1% (1.4 W/m2) higher in the peak years of 1979 (cycle 21) and 1991 (cycle 22) than in the quiet Sun years of 1985/86. Comparison with shorter, independent solar measurement sets and with empirical models qualitatively confirms the Nimbus-7 results. But these comparisons also raise questions of detail for future studies: in which years did the peaks actually occur and just how accurate are the models and the measurements?
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Kyle, H.L., Hoyt, D.V. & Hickey, J.R. A review of the Nimbus-7 ERB solar dataset. Sol Phys 152, 9–12 (1994). https://doi.org/10.1007/BF01473176
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DOI: https://doi.org/10.1007/BF01473176