. Relation between cloud index and clear sky index

The clear sky index is an appropriate and thus an established quantity for the description of the transmission properties of the Earth's atmosphere.

It is defined by

k* = Ig / Idear (3)

where the current global radiation Ig is related to the expected clear sky radiation Idear. In addition a model is needed, which describes the atmospheric conditions, a so called clear sky model, see sec. 2.2.

[Beyer et al. 96] introduced the relation

k* = 1 - n (4)

into the Heliosat method. This relation can be used without a previous calibration with ground data, but it is necessary that the clear sky model is optimally adapted to the regarded area. By Fontoynont et al. [2] relation (4) was improved in order to detail the case of complete cloudiness and to limit the clear sky index to meaningful values.



Benchmarking is the largest activity within the MESoR project. The aim of the benchmarking exercise is to establish a coherent set of benchmarking rules and reference data sets to enable …

Analysed databases and integrated systems

Each of the databases analysed here is integrated within a system (software setup) that provides additional tools for search, query, maps display, and calculation of derived parameters. PVGIS (the European …

Linke’s Turbidity Factor Applied to Worldwide Global. Horizontal Irradiance Measurements

Frank Bason SolData Instruments, Linabakken 13, DK-8600 Silkeborg, DenmarkCorresponding Author, soldata@soldata. dk Abstract The data collection phase of the Danish Galathea III Expedition was conducted from August 2006 until April …

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