====== Model intercomparison study for models that handle spherical geometry and polarization ======

==== Definition of test cases ====


=== First Setup ===

This setup has only been used by Patricia and myself. It has been modified (see below), mainly to calculate fewer tangent heights.
  * Geometry:

^  Scan     ^ solar zenith angle   ^  relative azimuth angle  ^ earth radius ^
|  1     |  77.77  |  22.23    |  6357.5  |
|  2     |  47.30  |  34.41    |  6364.9  |
|  3     |  28.71  |  67.56    |  6374.9  |
|  4     |  26.84  |  96.47    |  6377.7  |
|  5     |  52.88  |  142.55   |  6370.9  |
\\

  * Wavelengths: 295 300 350 450 550 750 950 1200 1400 1500 1700

  * Albedo: 0.1 (also test 0.0)

  * Pressure and temperature: US-standard atmosphere, for comparison also Rayleigh scattering coefficients are provided

  * output altitude: 100 km 

  * Scattering mode: single scattering and multiple scattering

  * Rayleigh depolarisation value: 0.0

[[limb_comp_setup|Setupn 1 details from Patricia]]


=== Second setup ===

[[limb_comp_setup2|Setup 2 details from Patricia]]

Rayleigh coefficients are provided on levels. Important: they have to be averaged for layers!!!!

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==== MYSTIC vs. SCIATRAN ====

Plots of the comparison can be found at

[[http://www.iup.uni-bremen.de/~patty/RTM_COMP/RAYLEIGH/PLOTS/MYSTIC_SCIATRAN/]]