Solar Radiation Measurement: Progress in Radiometry for Improved Modeling
Christian A. Gueymard and Daryl R. Myers
This chapter is designed to be a concise introduction to modern solar radiometry and how solar radiation measurements can be properly used for optimal solar radiation model development and validation. We discuss solar radiation fundamentals, components of solar radiation in the atmosphere, instrumentation used to measure these components, and accuracy of these measurements depending upon instrumentation performance, reference scale, calibration techniques, and quality control. The sources of measurement error are explained in detail, and a comprehensive assessment of the recent advances in radiometry is presented. Existing measurement networks and data sources are described. Various data quality assessment methods are also discussed. The concepts presented here can be successfully applied toward a more informed use of solar radiation data in a large range of applications.