====== initital setup for model comparison: V1.0 ======

Absorption: off
Mie scattering: off

**Geometry**

Coordinate system is topocentric at TOA (100 km)\\ 
Azim = phi(LOS)-phi(sun)\\ 
SZA: Solar Zenith angle\\ 
R_Earth: Earth radius computed from Latitude assuming r_x, r_y \\ 
TH: Tangent Height \\ 
LZA: LOS zenith angle\\ 

output altitude: 100 km 


A) 5 SCIAMACHY observation geometries

<code>
        SZA     Azim     R_Earth (! fixed !)

1       77.77   22.23    6370 
2       47.30   34.41    6370
3       28.71   67.56    6370
4       26.84   96.47    6370
5       52.88   142.55   6370

</code>

B) Scan of solar zenith angles and rel azimuth

<code>
SZA     0 30 60 90
Azim    0 45 90 135 160

TH      LZA             
0       79.9133616
5       80.1693976
10  80.4322137          
15  80.7023848  
20  80.9805720  
25  81.2675412  
30  81.5641889  
35  81.8715745  
40  82.1909661  
45  82.5239023  
50  82.8722809  
55  83.2384886  
60  83.6255974  
</code>    

**Wavelength**
<code>
325
450
765.1
1700
</code>

**Albedo**: 0.0 (Lambertian)


**Pressure and temperature file name**

US Standard
http://www.iup.uni-bremen.de/~patty/RTM_COMP/PROFILES/US_STANDARD/usstandard.dat

**RAYLEIGH parameters** (! depol factor > 0 !)

 
Bodhaine(1999) with Refractive index from [Peck & Reeder, 1972]; weighted King factor includes N2,O2,Ar, and CO2

**scattering coefficients**

[[http://www.iup.uni-bremen.de/~patty/RTM_COMP/PROFILES/BODHAINE/|]] ray_coef*.dat

Format: 
  * 1st column = grid point [km] (starts at 100 km)
  * 2nd column = volume scattering coefficient [1/km]

**Output format**

A) file name: [model]01_[wavelength]_az[azimuth]_V01.dat, e.g. \\
model = sciatran \\  
01 = case for atmospheric setting, i.e., Rayleigh SS \\ 
wavelength =  324 450 765 1700 \\ 
azimuth = 22 35 68 96 143 \\
V01: version 01 \\ 
\\ 
example: sciatran01_325_az22_V01.dat \\


Format: 5 lines comment (start with '#') \\ 
13 Lines with:  \\ 
TH [km] I [phot/sr/cm2/nm] per unit irrad. Q/I U/I V/I L_p=sqrt(Q/I^2+U/I^2) \\ 


B) file name: [model]01_[wavelength]_z[sza]_azscan_V01.dat, e.g. \\ 
sza = 0 30 60 90 \\ 
rest as above \\ 

example: sciatran01_325_z30_azscan_V01.dat \\

Format: 5 lines comment (start with '#') \\ 
13 Lines with: \\ 
TH [km] 5x I [phot/sr/cm2/nm] per unit irrad. Q/I U/I V/I L_p=sqrt(Q/I^2+U/I^2) \\ 
for azim = 0 45 90 135 160 \\ 


**All SCIATRAN output files** are in: \\ 
http://www.iup.uni-bremen.de/~patty/RTM_COMP/SCIATRAN/SS-Rayleigh/