A New Point of View on the Relationship Between Global Solar Irradiation and Sunshine Quantifiers

0455902 - ÚI 2016 RIV US eng J - Journal Article
Brabec, Marek - Badescu, V. - Dumitrescu, A. - Paulescu, M.
A New Point of View on the Relationship Between Global Solar Irradiation and Sunshine Quantifiers.
Solar Energy. Roč. 126, March (2016), s. 252-263. ISSN 0038-092X. E-ISSN 1471-1257
Institutional support: RVO:67985807
Keywords : global solar irradiation * sunshine quantifiers * sunshine number * Angstrom equation * statistical modeling * regression analysis
OECD category: Statistics and probability
Impact factor: 4.018, year: 2016

The relationship between the clearness index and the time averaged sunshine number is studied over short time intervals such as one hour. Several non-linear statistical models have been used. Meteorological and radiometric data from various weather stations of Romania (South-Eastern Europe) are analyzed. Nonlinearity of the relationship is only apparent near the boundary for relative sunshine sigma of 0 or 1 and manifests itself in clearness index jumps mainly at sigma = 0 rather than sigma = 1. The negative clearness index jump at r = 0 decreases while the slope of the relationship increases when the sunshine number is averaged over longer time periods.
Permanent Link: http://hdl.handle.net/11104/0256502