UV index and UV dose: data product description
data version 2.0

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UV radiation

UV index
UV dose

Main data product description page


The TEMIS UV index and UV dose data are computed from the assimilated global ozone field at local solar noon, i.e. at the moment the Sun is highest in the sky, which in case of the UV dose is combined with the daily variation of the position of the Sun above the horizon.

There are two UV data records, based on different ozone data:

Clear-sky UV index and clear-sky UV dose data is provided for both ozone records and covers the whole world. Cloud-modified UV dose data is provided only for the operational ozone record and covers the part of the world observed by the geostationary Meteosat Second Generation (MSG) satellites.


Details of the computation of the UV index and UV dose

===> Publications and references for the TEMIS UV data services and datasets.


Data files and plots

The UV index and UV dose data are given at a latitude-longitude grid of 0.25 by 0.25 degrees covering the whole world in HDF-4 files. UV index files contain the clear-sky local noon UV index data, whereas UV dose files contain both the clear-sky and cloud-modified UV dose data. All files also contain the local solar noon ozone data at the UV grid.

The structure of these files is described on a separate page.

The website shows plots of the UV index and UV dose data in four domains: World, Europe, Netherlands and Dutch Caribbean.


Data version 2.0 improvements w.r.t. older versions

A first evaluation of the data has shown that the differences in the cloud-free UV index and UV dose data lie on the whole within the error on the v2.0 data, except for a few specific events.

The major improvements lie in the treatment of the attenuation of the UV radiation by clouds and the estimate of the error on the UV index and UV dose.

Overview of the main improvements of version 2.0 with respect to version 1.4:


The differences between the older versions (v1.0-1.4) are minimal.

Version information
version  date remarks
2.0 29 May 2017   major upgrade of the UV index & UV dose processing
1.4 9 Jan. 2012 UV dose processing chain ported to new system
1.3 24 May 2009 UV dose processing updated to new MSG cloud cover area
1.2 April 2008 reprocessed GOME-1 data using GDP-4 ozone (was GDP-3)
1.2 June 2006 switch to Meteosat Second Generation cloud data
1.1 Feb. 2004 updated cloud modification
1.0 April 2003 first operational version


last modified: 21 March 2019
data product contact: Jos van Geffen & Michiel van Weele & Ronald van der A
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