******************  SMARTS2, version 2.9.2  *******************

 Simple Model of the Atmospheric Radiative Transfer of Sunshine
                    Chris A. Gueymard, July 2002, Revised March 2003

    This model is documented in FSEC Report PF-270-95
 and in a Solar Energy paper, vol. 71, No.5, 325-346 (2001)

 NOTE: These references describe v. 2.8 or earlier!!!
 See the User's Manual for details on recent changes...

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       Reference for this run: ASTMG-173 USSA_AOD_0.084_v2.9.2                                 

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* ATMOSPHERE : USSA   AEROSOL TYPE: S&F_RURAL 

* INPUTS:
     Pressure (mb) = 1013.25   Altitude (km) =  0.000
     Relative Humidity (%) =  45.45   Precipitable Water (cm) = 1.4164
     Ozone (atm-cm) = 0.3438 or 343.8 Dobson Units
     Season = SPRING/SUMMER
   AEROSOLS:  Optical Depth at 500 nm = 0.0840   Optical depth at 550 nm = 0.0764
     Angstrom's Beta = 0.0333   Schuepp's B = 0.0365
     Visual Range (km) =  124.2   Visibility (km) =   95.1
     Alpha1 = 0.9640  Alpha2 = 1.4315   Mean Angstrom's Alpha = 1.1978

* TEMPERATURES:
     Ground Level, Instantaneous = 288.2 K
     Sea Level, Daily Average = 288.2 K
     Ozone (effective) = 225.4 K
     NO2 (effective) = 225.4 K


The following spectral variables will be output to file: SMARTS2.EXT             

 * Global_tilt_irrad.
 * Direct+circumsolar


  Spectral ZONAL albedo data: LIGHT_SANDY_SOIL        
   with a reflection process: NON_LAMBERTIAN


* GEOMETRY (half-angles) OF THE SIMULATED RADIOMETER (deg.):
   Slope =  0.00   Aperture =  2.90   Limit =  0.00

** WARNING! The radiometer's Slope and Limit angles are not provided.
Circumsolar calculations will therefore be performed for
an average geometry corresponding to the Aperture angle.



  Spectral LOCAL albedo data: LIGHT_SANDY_SOIL        
   with a reflection process: NON_LAMBERTIAN



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* SOLAR POSITION (deg.):
    Zenith Angle (apparent) = 48.236  Azimuth (from North) =  180.00

  RELATIVE OPTICAL MASSES:
  - Rayleigh =  1.500
  - Water Vapor =  1.501
  - Ozone =  1.498
  - NO2 =  1.500
  - Aerosols =  1.501


 CO2 Mixing Ratio (ppmv):  370.0



 Total column abundances for all gases except H2O (atm-cm) and normal/standard conditions:

   BrO        CH2O       CH4        ClNO3      CO         CO2        HNO2       HNO3       NH3

0.2500E-05 0.3000E-03 0.1285E+01 0.1200E-03 0.8747E-01 0.2971E+03 0.1000E-03 0.3811E-03 0.1300E-03


   NO         NO2        NO3        N2         N2O        O2         O3         O4         SO2

0.3211E-03 0.2044E-03 0.5000E-04 0.3719E+01 0.2385E+00 0.1678E+06 0.3438E+00 0.1678E+06 0.1071E-03




* ANGLES (deg.) FOR TILTED SURFACE CALCULATIONS: 
   Surface Tilt =  37.000   Surface Azimuth (from North) = 180.000
   Incidence Angle =  11.236

  Diffuse irradiance ratios (tilted plane/horizontal):
      0.8993  (isotropic approximate conversion--for reference)
      1.2420  (anisotropic conversion model--used here)



*  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *

 * SPECTRUM:
  Total (0-100 µm) Extraterrestrial Irradiance used here = 1367.00 W/m2
  (i.e., 1.0000 times the selected solar constant, 1367.00 W/m2, due to the actual Sun-Earth distance.)
  Source for selected solar spectrum: SMARTS_Gueymard         


Wavelength Range =  280.0 to 4000.0 nm ;   Number of Wavelengths =  2002

*** BROADBAND IRRADIANCES (W/m2):

* DIRECT BEAM AT NORMAL INCIDENCE:
  Extraterrestrial = 1347.94   Terrestrial =  897.91   Atmospheric Transmittance = 0.6661

* FOR THE HORIZONTAL PLANE:
  Direct Beam =  598.07   Diffuse =  94.72   Global =  692.79
  Diffuse irradiance components:
  Rayleigh scattering =  42.37   Aerosol scattering =  38.30   Backscattering =  14.04

* FOR THE TILTED PLANE: 
  Direct Beam =  880.70 Sky Diffuse =  95.80   Ground Reflected =  23.87   Global = 1000.37

* EXPERIMENTAL (WITH CIRCUMSOLAR CORRECTION):
  Direct Beam, Normal Incidence =  900.14   Diffuse Horizontal =  93.23   Global Horizontal =  692.79