DLR-ISIS
Irradiance at the Surface derived
from ISCCP cloud data
The DLR-ISIS data set
gives an overview of the available total solar irradiance worldwide
(global hemispherical irradiance, GHI). Many solar energy applications,
especially concentrating solar power plants, require knowledge of the
beam irradiance (direct normal irradiance, DNI). DLR-ISIS provides both
solar flux components for all regions on Earth and can be used to
estimate technical potentials for solar energy systems. Its long
temporal coverage over more than 21 years makes it possible to derive stable
longterm averages, to evaluate the variability of irradiance from year
to year and to study the effect of extreme atmospheric conditions on the
irradiance at the surface, e.g. after a volcano eruption. The analysis of
the long-term variability of DNI contributed to the approval of several
50 MW solar thermal power plants
in Southern Spain.
The 3-hourly temporal resolution of ISIS enables the study of daily
cycles. However, the spatial resolution of 280 km by 280 km is too
coarse for site selection. For detailed siting of solar power
plants we recommend using data with higher resolution, e.g. those
from the SOLEMI-service.
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