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Thus, sometimes even data access and correct interpretation is a difficult task. It can be concluded that the solar radiation data from present databases are not matching many of the application requirements. There is enough room for efforts in integrating information systems to diminish the discrepancy between data availability and end user needs. In the following, two large surface networks, World Radiation Data Center (WRDC) and Baseline Surface Radiation Network (BSRN) are summarized, while some national networks are only enumerated.

Since the Sun radiance varies to some extent over short and long periods (Fröhlich 1991), the solar constant does not remain steady over time. There is a variation of about ± 1 Wm-2 around the mean solar constant during a typical Sun cycle of 11 years (Gueymard and Myers 2008). 1 Wm-2 (Gueymard 2004). When the solar radiation flux passes through the Earth’s atmosphere, its spectral distribution is modified by absorption and scattering processes. The complex effect experienced by solar radiation flux spectral distribution when transiting the Earth’s atmosphere is also illustrated in Fig.

Quality control and quality assurance occur before and during data collection and include procedures such as the proper selection and installation of instruments and data acquisition equipment, as well as regular maintenance and calibration. Collected data are also post processed, to check in a final quality assessment whether a data value is reasonable, too small, too large, or missing. All European countries have established and maintain national networks for solar radiation measurements and contributing to WRDC database.

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