Global Solar Radiation Analysis of the Modified Savin-Angström Method by using Pyranometers CMP 6 and CMP 11


Authors: Ján Čimo and Beáta Novotná

Volume/Issue: Volume 21: Issue 1

Published online: 24 Aug 2018

Pages: 20–24



Solar energy is one of the most available energy sources and the most ecological one. Currently, the firm Kipp & Zonen belongs to prominent producer of sensors for measuring global radiation. These sensors are the most used ones in our country and also in network of meteorological measurements of WMO. Therefore, the two types of measuring sensors for global radiation (pyranometer PMP 11, CMP 6) in comparison with the calculation method Savin-Angstrom are analysed. By processing the experimental measurements of global radiation in locality Nitra, there can be observed differences between standard CMP 11 and CMP 6. The measured values by CMP 6 pyranometer in comparison with secondary standard CMP 11 are lower by about 21% to what corresponds to the accuracy level (First Class) of sensor CMP 6. Differences may have been caused by higher aberrance of non-linearity, aberrance at sunrise and sunset i.e. directional errors and also by the fact that sensor CMP 6 is not equipped with integrated temperature compensation. The similar situation was also in the comparison of global radiation, which was calculated according to the modified Savin-Angstrom method and CMP 11. Notional differences were 7% compared with the measured values of CMP 11 standard.

Keywords: global radiation, pyranometer, Savin-Angstrom method



Čimo J. et al. 2014. Biometeorologia. Nitra : SPU 2014 145 p. ISBN 978-80-552-1219-7.

Čimo J. et al. 2012. Prakticka biometeorologia 1. Nitra : SPU 2012 201 p. ISBN 978-80-552-0771-1.

Czegeny G. et al. 2016. UV-B effects on leaves - Oxidative stress and acclimation in controlled environments. In Plant Science vol. 248 2016 July pp. 57-63.

Kanuk J. 2007. Analyza solarneho žiarenia pre urbanne uzemia. In Zbornik zo VIII. vedeckej konferencie doktorandov a mladych vedeckych pracovnikov Nitra : UKF 2007. ISBN 978-80-8094-106-2.

Meza F. - Varas E. 1999. Estimation of mean monthly solar global radiation as a function of temperature. In Agricultural and Forest Meteorolog Elsevier 1999 pp. 231-241. Dostupne na:

Španik F. et. al. 2009. Agroklimaticke hodnotenie krajiny a zaklady agroklimatickej rajonizacie. Nitra : SPU 2009 88 p. ISBN 978-80-552-0236-5.

Španik F. - Tomlain J. 1983. Časove rozloženie slnečnej energie a možnosti jej využivania v poľnohospodarskych oblastiach ČSSR. Nitra - Bratislava : OVHZM ČSAZ 1983.

Sunita K. et al. Impact of increasing Ultraviolet-B (UV-B) radiation on photosynthetic processes. In Journal of Photochemistry and Photobiology B: Biology vol. 137 2014 August pp. 55-66.