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A 4.5 km resolution raster dataset representing mean Global Horizontal Irradiance (GHI) in kWh (kilowatt-hours) per square-meter per day at each point in the National Solar Radiation Database (NSRDB) from 1998 to 2018 as calculated by Sengupta et al. (2018), and then put into 8 quantile bins for interpretation and reporting. For more information and further data, please visit Sengupta, M., Xie, Y., Lopez, A., Habte, A., Maclaurin, G., and Shelby, J., 2018, The National Solar Radiation Data Base (NSRDB): Renewable and Sustainable Energy Reviews, v. 89, p. 51-60.
The reliability of solar irradiance measurements is dependent on the calibration of the pyranometer used to make them. Internationally recognized standards for pyranometer calibrations require resources that may not be available to all observers. To fill this gap, we propose a method of homogenizing hourly solar radiation time series based on comparison of clear-sky radiation observations against estimates derived from a clear-sky radiation model. Inhomogeneities in the record are identified based on shifts in pyranometer response in relation to the model estimates, and corrected to produce a homogeneous time series. This method was applied to the ∼23 year record of hourly solar irradiance measurements recorded...

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