==== Case B 1: Rayleigh scattering, standard atmosphere ====

In this case it shall be tested whether the coupling between model layers is correctly included.

//Setup://

  * model atmosphere with 30 layers, optical thicknesses provided in {{:intercomparisons:phase_b:tau_rayleigh_450.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

  * output altitudes: 0 km, 1 km, 30 km
  * sun position  (//sza//=60°, //saa//=0°)
  * viewing zenith angles: 
    * at 0 km : //vza//: 0° - 85°, 5° increment
    * at 1 km: //vza//: 0° - 180°, 5° increment (without 90°)
    * at 30 km: //vza//: 95° - 180°, 5° increment 
  * viewing azimuth angle //vaa//: 0° - 180°, 5° increment	     

//Output format://

  * The output should be provided in the same format as for case A1 ([[intercomparisons:a1_rayleigh|Rayleigh scattering]]). 


=== Results ===

//Difference plots// between the models IPOL, 3DMCPOL, SPARTA (previously named TROPOS), SHDOM, PSTAR and MYSTIC for the full radiation field:\\
{{:intercomparisons:phase_b:b1:diff_b1_3dmcpol.pdf|3DMCPOL}}\\
{{:intercomparisons:phase_b:b1:diff_b1_ipol.pdf|IPOL}}\\
{{:intercomparisons:phase_b:b1:diff_b1_tropos.pdf|SPARTA}}\\
{{:intercomparisons:phase_b:b1:diff_b1_shdom3.pdf|SHDOM}}\\
{{:intercomparisons:phase_b:b1:diff_b1_pstar.pdf|PSTAR}}\\

//Data// of all models (MYSTIC and 3DMCPOL include also standard deviation):\\
{{:intercomparisons:phase_b:b1:iprt_case_b1_mystic.dat|MYSTIC}}\\	 
{{:intercomparisons:phase_b:b1:iprt_case_b1_3dmcpol.dat|3DMCPOL}}\\
{{:intercomparisons:phase_b:b1:iprt_case_b1_ipol.dat|IPOL}}\\
{{:intercomparisons:phase_b:b1:iprt_case_b1_tropos.dat|SPARTA}}\\
{{:intercomparisons:phase_b:b1:iprt_case_b1_shdom3.dat|SHDOM}}\\
{{:intercomparisons:phase_b:b1:iprt_case_b1_pstar.dat|PSTAR}}\\