See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/226000834 Relationships between photosynthetically active radiation and clearness index at Bloemfontein, South Africa Article in Theoretical and Applied Climatology · February 2005 DOI: 10.1007/s00704-004-0080-5 CITATIONS 37 READS 64 2 authors, including: Sue Walker University of the Free State 141 PUBLICATIONS 1,314 CITATIONS SEE PROFILE All content following this page was uploaded by Sue Walker on 26 September 2014. The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original document and are linked to publications on ResearchGate, letting you access and read them immediately.