Open Access

Fig. 3

image

Download original image

Temporal distribution of solar irradiation on a horizontal surface, extra-terrestrial solar irradiance on a horizontal surface, clearness index, and airmass on 2021/09/05. The number of cloud layers determined by sky images is also shown. The clearness index exceeded unity around 14:30 due to a cloud enhancement event. When the extra-terrestrial solar irradiance was <50 W/m2, the clearness index was set to zero.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.