<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The fluctuation of solar radiation at ground level represents a challenge in modeling the time series of solar irradiance. A procedure for the quantification of the instability of the solar radiative regime is reported. This procedure is based on the clearness index, as the ratio of the horizontal solar irradiance measured at ground level and the estimated one at extraterrestrial level. New quantities for classifying the days from the radiative stability point of view are being introduced. A procedure for classifying days according to their stability regime as stable, variable and unstable is presented.</p></abstract>

The fluctuation of solar radiation at ground level represents a challenge in modeling the time series of solar irradiance. A procedure for the quantification of the instability of the solar radiative regime is reported. This procedure is based on the clearness index, as the ratio of the horizontal solar irradiance measured at ground level and the estimated one at extraterrestrial level. New quantities for classifying the days from the radiative stability point of view are being introduced. A procedure for classifying days according to their stability regime as stable, variable and unstable is presented.

Quantification of the Solar Radiative Regime Variability Based on the Clearness Index

Annals of West University of Timisoara - Physics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

The fluctuation of solar radiation at ground level represents a challenge in modeling the time series of solar irradiance. A procedure for the quantification...

Quantification of the Solar Radiative Regime Variability Based on the Clearness Index

Published Online: Oct 23, 2017

Page range: 13 - 17

Received: Sep 25, 2016

Accepted: Nov 30, 2016

DOI: https://doi.org/10.1515/awutp-2016-0003

Keywords
Clearness index, solar radiation variability

© 2016 Sergiu Lucaciu et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Quantification of the Solar Radiative Regime Variability Based on the Clearness Index

Published Online: Oct 23, 2017

Page range: 13 - 17

Received: Sep 25, 2016

Accepted: Nov 30, 2016

DOI: https://doi.org/10.1515/awutp-2016-0003

KeywordsClearness index, solar radiation variability

© 2016 Sergiu Lucaciu et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
Clearness index, solar radiation variability