The text file "Solar radiation.txt" contains hourly data and associated flag codes from January 1, 1948, to September 30, 2014. The primary source of the data is the Argonne National Laboratory, Illinois.The first four columns give year, month, day and hour of the observation. Column 5 is the data in Langleys and column 6 is the flag (three digit code). The codes have been created to identify the solar radiation data processing. They indicate if the data are original or missing, the method that was used to fill the missing periods, and any other transformations of the data. Bera (2014) describes in detail an addition of a new code based on the regression analysis of the backup data series at St. Charles (STC) for water years (WY) 2008–10. The user of the data should consult Over and others (2010) and Bera (2014) for the detailed documentation of the data codes.
Reference Cited:
Over, T.M., Price, T.H., and Ishii, A.L., 2010, Development and analysis of a meteorological database, Argonne National Laboratory, Illinois: U.S. Geological Survey Open File Report 2010-1220, 67 p., http://pubs.usgs.gov/of/2010/1220/. Bera, M., 2014, Watershed Data Management (WDM) database for Salt Creek streamflow simulation, DuPage County, Illinois, water years 2005-11: U.S. Geological Survey Data Series 870, 18 p., http://dx.doi.org/10.3133/ds870.