I need a solar radiation data in central Asia. Is there any global dataset of solar radiation?
If someone know about it, please send to me the link.
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Do you know soDa services ? You should see if they provide geo-localized data for registered users. From what I know, they don't do it for free.
By the way, you can get it from grass using r.sun : http://grass.osgeo.org/grass64/manuals/html64_user/r.sun.html
If you want spatiotemporal data of historical/gridded global solar radiation, you can check out the NCEP/NCAR Reanalysis datasets (e.g., other flux). The data spans from 1948–2010, and you can get a variety of time resolutions (e.g., daily, monthly, etc.). The spatial resolution is coarse (as it is global) and the format is GRIB or NetCDF, which you can read/process with GDAL, NCL or other software.
I don't know what you mean by 'global' in this context, but U. Colorado's Laboratory for Atmospheric and Space Physics' Interactive Solar IRradiance Datacenter has a number of irradiance products, including total solar irradiance.
Most of their data is from spacecraft, so they measure the change in output of the sun, not necessarily how much reaches the ground in a given region.
Solargis released a set of solar resource data: yearly long-term averages, 30 arc-sec pixel (~1 km), free to download (CC BY 3.0 IGO licence), all metadata included.
It is published via GlobalSolarAtlas or downloadable from Solargis website, downloadable per country or complete World dataset. (Some countries still missing but can be clipped from the World's data).
Data is ready-to-use in GIS, two formats are available:
ESRI ASCII Grid