HelioClim-3 Real time data and forecast
The HelioClim-3 (version 4) Persistence Forecast is based on the "persistence of Kc". We remind that the Kc index corresponds to the Global Horizontal component divided by the GHI in clear sky conditions (GHI/GHI_cls). You may see it as the "percentage of clouds". This method computes the last available Kc value and extend this value for the remaining slots of the day, taking into account of course the time of the day. As a consequence, at least one slot of the day should be available. The HelioClim-3v4 Persistence Forecast predicts the current day and is available only after sunrise.
The HelioClim-3v4 Similarity Persistence has been developed to predict irradiance for the next day based on a statistical study of the long term HelioClim-3 irradiation database. This algorithm searches in the past for the most similar days to the current day of interest and uses their following days to produce a forecast. The HelioClim-3v4 Similarity Forecast predicts tomorrow and is available after today's sunset.
NB: HelioClim-3v5 can not be available in real time and forecast since the data are only available at d-2.
This web service provides time series of all the components of the radiation over a horizontal, fix-tilted and normal plane for the actual weather conditions and for clear-sky conditions. The geographical coverage corresponds to the Meteosat field of view, i.e. covers Europe, Africa, Atlantic Ocean, Middle East. Data are available with a time step ranging from 15 min to 1 hour.
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