If you want spatiotemporal data of historical/gridded global solar radiation, you can check out the NCEP/NCAR ReanalysisNCEP/NCAR Reanalysis datasets (e.g., other fluxother 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 GDALGDAL, NCLNCL or other software.
Glorfindel
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