Simple Solar Spectral Model for Direct and Diffuse Irradiance on Horizontal and Tilted Planes at the Earth's Surface for Cloudless Atmospheres 

Table 4-2 Diffuse Horizontal Spectral Irradiance Comparison of Dave Results with SPCTRAL2 Results for a Rayleigh Atmosphere with Molecular Absorption. (O3 = 0.31 atm-cm, H2O = 2.93 cm)
Z = 0°  Z = 60°  Z = 80° 
(µm)  Dave SPCTRAL2 Dave SPCTRAL2 Dave SPCTRAL2
             
  0.31  75.5  94.9    21.5  28.5    1.1  0.8   
  0.36  222.2  221.2    167.7  175.4    72.9  88.1   
  0.415  234.5  227.7    199.8  198.0    118.0  124.6   
  0.515  108.1  103.8    99.9  96.3    75.6  73.1   
  0.615  46.6  44.9    43.7  42.1    34.6  33.0   
  0.7035  23.4  22.6    22.7  21.8    20.6  19.3   
  0.725  16.7  17.3    15.6  16.1    13.9  13.0   
  0.9935  3.3  3.1    3.2  3.1    3.2  2.8   

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