Spectral Solar Radiation Data Base Documentation, Vol. II

Table of Contents

1.0 Introduction


This volume can be used as a catalog for the information contained in the data base. Each page of graphs represents the data measured on one day of the year, from October 1986 through April 1988, at one of three locations: the Florida Solar Energy Center (FSEC), Cape Canaveral, Fla.; the Pacific Gas and Electric Company (PG 5cE), San Ramon, Calif.; and the Solar Energy Research Institute (SERI), Golden, Colo.

The following information is contained on each page:

  1. Field notes. The first line of the field notes begins with an "N" followed by the site, year, and day number. The second line contains a log sheet number (FSEC only), day number, date, serial number of the LI-COR spectroradiometer(s), and measurement mode(s). The measurement modes are direct normal DN (irradiance from the solar disk in about a 5-deg field of view), global normal GN (flat plate tracking the sun), global horizontal GH (flat plate on a horizontal surface), global tilt GT (flat plate tilted at or near the latitude angle), and diffuse horizontal DF. Next are operator observations, such as weather or instrument operations, observations about the data, and notes on the existence of all-sky pictures. (The pictures are labeled as good G, marginal M, or poor P.)

  2. Broadband solar radiation graph. The broadband solar radiation values (in watts per square meter) recorded by Eppley Precision Spectral Pyranometers and a Normal Incidence Pyrheliometer, before the spectral data were acquired, are plotted versus standard time. The site and day number are printed at the top of the graph. The four measurement modes (if available) include global normal GN, direct normal DN, global tilt GT, and global horizontal GH.

  3. Spectral solar radiation graph(s). The spectral solar radiation data acquired on this day are graphed for each measurement mode. The titles of the graphs include site, day number, and measurement mode (including a symbol for the spectroradiometer foreoptics). The measurement modes are:

Spectral irradiance (in watts per square meter per nanometer) is graphed versus wavelength in nanometers. The legends to the right of the spectral graphs give the standard time and air mass when the spectra were acquired. PG&E and SERI operated one spectroradiometer, rotating through measurement modes. FSEC generally operated two spectroradiometers simultaneously, with one in the direct-normal mode and the other inone of the global modes.

3.0 Daily Notes and Graphs

Table of Contents

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