Clear-sky irradiance predictions for solar resource mapping and large-scale applications: Improved validation methodology and detailed performance analysis of 18 broadband radiative models

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Global horizontal irradiance clear sky models : implementation and analysis. (2012, background): “Christian Gueymard’s REST2 model predicts cloudless-sky broadband irradiance, illuminance, and photosynthetically active radiation [29].”
History and trends in solar irradiance and PV power forecasting: A preliminary assessment and review using text mining (2018, methodology): “40 for very clean to hazy atmospheric conditions, but extremely high values above 1 do occur in various situations or regions Gueymard (2012b); LaraFanego et al.”
McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions (2013, background): “As it describes the SSI in a cloud-free atmosphere, it estimates a realistic upper limit of the SSI (Gueymard, 2012; Long and Ackerman, 2000).”
Identification of periods of clear sky irradiance in time series of GHI measurements (2016, unknown): “Harrison, Chalmers, and Hogan used GHI and diffuse to determine cloud amount and discriminate between stratiform and convective cloud types (Harrison et al., 2008).”