This section of the CD-ROM contains additional material supporting the information in 

Chapter 1: 
Solar radiation: Practical measurements and model validation 

of the book:  
Modeling Solar Radiation at the Earth's Surface.
Recent Advances

published by Springer-Verlag, Heidelberg

November 2007
-------------------------------------
This folder contains two sub-folders and 5 files.

Besides this READ ME file, the four other files include:

Two PDF files of Broadband Outdoor Calibration (BORCAL) results from two different calibration events at two sites in the US. These are:

2006-02_ARM_SGP_Full.pdf:  

This is a complete, 519 page report on the calibration of 103 solar radiometers for the US DOE Atmospheric Radiation Meausurement Program. The report provides data on the variability of various makes and models of solar radiation detectors. It demonstrates the full characterization of each instrument for a large population.


2006-02_NREL_SRRL_BMS.pdf:

This is a report for National Renewable Energy Laboratory (NREL) Baseline Measurement System (BMS) radiometers to give examples of a wider range of instruments (Kipp and Zonen, Eppley, Licor). The structure is the same as the SGP report, but covers only 10 instruments.  


Each report describes several alternative Responsivity numbers available to the user, based on his uncertainty needs:

(a) Single Responsivity at Z=45 Deg +/- 0.2 Deg; Valid with the individual computed uncertainties quoted for the Zenith Angle range 30 < Z < 60

(b) Responsivity in each 9 Deg Bin from  0<= Z <= 90 (if attained during the calibration)

(c) Responsivity in each 2 Deg Bin from  0<= Z <= 90 (if attained during the calibration)

(d) Latitude weighted/optimized Responsivity, where the Rs at a given latitude is 'corrected' for the range of zenith angles attained, weighted by the derived cosine response curve

(e) a description of the Rs function approximation. Coefficients for the RS function are for these processes are available from the ARM Instrumentation Monitoring (AIM) website at 

http://www.nrel.gov/aim/  in the "Calibration History" link.

Other example BORCAL PDF reports for the period from 1997 to present are available at 
http://www.nrel.gov/srrl/borcal.html

The Gueymard_spectrum_2003.txt contains the "Synthetic/composite Extraterrestrial Spectrum by Chris Gueymard, 
May 2003" ("Reference: C. Gueymard, ""THE SUN'S TOTAL AND SPECTRAL IRRADIANCE FOR SOLAR ENERGY APPLICATIONS AND 
SOLAR RADIATION MODELS"", submitted to Solar Energy, 2003."	

The two other files are the REFERENCE IRRADIANCE files for the two reports.
These files include the Reference Absolute Cavity Radiometer Beam Irradiance, the Reference Diffuse Irradiance, and the computed Reference Global Irradiance as fucntion of time, zenith angle, and azimuth angle.

The folder CM22_all_rs_NREL2006_02 contains ascii files (downloaded from the AIM database) for a single CM22 radiometer in the NREL 2006-02 Borcal event.

The folder NREL2006-02Coeff contains all of the RS function Coefficient files for all of the pyranometers in the NREL2006-02 report, and the 2 deg RS file for the one Eppley Pyrheliometer in that calibration event.

There is also an EXCEL workbook RCC_Function_RSCalculator.XLS:

This can be used in conjunction with the Coefficient files to compute RS for specific Zenith angles. By opening a Coefficient file with Excel, and copying and pasting the resultant coefficients into the RS computation columns C and D, responsivity curves for the radiometer are generated.

These examples may be used, in conjunction with calibration data, BORCAL reports, and even measured data accessible through the NREL Measurement and INstrumentation Data Center (MIDC) for studies or radiometer characteristics and their impact on model development and validation.

For more Information, visit

http://www.nrel.gov/midc
http://www.nrel.gov/srrl
http://rredc.nrel.gov











