==== Case E1: Rayleigh scattering, US standard atmosphere ====

In this case we include the US standard atmosphere, the corresponding Rayleigh scattering optical thickness profile is provided for 450nm. 

//Setup://

  * model atmosphere US-standard, scattering optical thickness provided in file {{:intercomparisons:phase_e:tau_rayleigh_450nm_usstd.dat|}}. The file includes 2 columns where the first is the altitude of the layer boundaries in km, and the second is the layer optical thickness (e.g. the value for 0 km corresponds to the optical thickness for the layer from 0 to 1 km).  
  * wavelength: 450 nm 
  * no molecular absorption
  * Rayleigh depolarization factor: 0.03
  * surface albedo: 0
  
  * Earth radius: 6371 km
  * Height of atmosphere: 120 km

  * E1_1: Polarized zenith radiance as a function of sun position 
    * solar zenith angle: //sza//: 80°-100° (90° corresponds to horizontal direction)
    * solar azimuth angle: //saa//: 65°
    * viewing zenith angle: 5°
    * viewing azimuth angle: 0°

  *D1_2: Limb radiance at top of atmosphere for tangent heights between 0 and 90 km
    * viewing zenith angle at TOA: //vza//: corresponding to tangent heights 0-90km, 2km increment 
    * viewing azimuth angle at TOA: //vaa//: 0°
    * solar zenith angles: //sza//: 60°
    * solar azimuth angles: //saa//: 0°, 90° 
  

//Output format://

Please include your data in the netcdf file {{:intercomparisons:phase_d:iprt_phase3_model.nc|IPRT_phase3_MODELNAME.nc}}.