HelioClim-3 Real-Time and Forecast

To benchmark real-time and forecast solar irradiation

HelioClim-3 database

HelioClim-3 is a satellite-derived solar radiation database exploiting Heliosat-2 method to estimate a "cloud index", based on the analysis of the Meteosat Second Generation satellite images in the visible band.

Real-time and Forecast web service

This web service provides time series of all radiation components over horizontal, fix-tilted and normal planes. Data are available with a time step ranging from 1 min to 1 day.

It addresses 2 different services:

Current day solar radiation


Tomorrow solar radiation forecast

HelioClim-3 is updated in real time, and time series are completed until the end of the day using a "persistence model". At least one slot after sunrise must be available to trigger the computation.   Tomorrow forecast has been developed using a "similarity model" based on a statistical study of the long term HelioClim-3 database.


Meteorological database

Retrieve HC3 time series together with meteorological data in a single CSV file. Source of the Meteo Data: GFS (NCEP) for today and tomorrow. Just set to "True" the "Add meteo data" input parameter.

Web service usage



Today automatic access

Tomorrow automatic access


Contact us for a quotation


Early 2021, the access to this web service will require the registration of an account with an email address.