JGR-Atmospheres has highlighted a recent paper published in this journal about shadow-ring correction models for diffuse solar irradiance. The leader of this relevant paper is Guadalupe Sanchez from AIRE Research Team at University of Extremadura. Diffuse data measured by a shadow ring must be corrected for the portion of irradiance blocked by the ring. The authors found that the shadow ring itself blocks about 11% of the diffuse radiation reaching a sensor. They state the need to adjust empirical models to local conditions since local factors, such as aerosols and cloud cover, significantly affect estimates of diffuse radiation. Thus, the results of this study show that locally fitted empirical models perform better than globally valid theoretical models.
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