The last number in the 41st line is the spectral integral. If a second spectroradiometer was used, the next 41 lines follow the same format. The first two lines are followed by field notes. The upper and lower measurement uncertainty limits are given in the columns following wavelength, with the appropriate measurement mode, dates, and description at the top of the column. The format of this data base was established at SERI to accommodate expanded, multiyear, long-term data collection.
Users can reformat the data to suit their particular needs.
These graphs provide information on atmospheric conditions during the day. For example, Figure 4-3 shows daily broadband and spectral plots for partly cloudy conditions when solar radiation is changing rapidly throughout the day. The sun is obscured when the direct-normal values drop to zero and the global values approach each other. Figure 4-1 shows a clear day. No data should be used without consulting the quality-control information, daily notes, and measurement uncertainty.