Here you can find a set of models describing the atmospheric refraction and dispersion.

Contents:

• atmosphericModel.py : Python model that can be used to calculate the atmospheric refraction and dispersion
• refractionModel.py : Python script that compares the output of the different rerfraction models. Can be used as an example on how to use atmosphericModel.py
• 1976USSA.txt : Table with temperature, pressure, density and more as a function of altitude. Values derived from the 1976 U.S. Standard Atmosphere.
• manual.pdf : Manual for using atmosphericModel.py
• atmospheric refraction example: jupyter notebook example
• [Tech note]...models.pdf : Tech note describing the models.

On the dispersion model: Dispersion model from Ciddor, 1996, calculates the index of refraction of air using the following parameters:

• Temperature
• Pressure
• Relative humidity
• CO2 density

On the atmospheric refraction / atmospheric dispersion models: Available models:

• Full integration using the refractive integral (requires detailed information about the atmosphere, e.g. 1976USSA.txt)
• Plane-parallel atmosphere refraction model
• Cassini's homogeneous atmosphere refraction model
• Oriani's theorem ( A*tan(z) + B^*tanˆ^3(z) )
• Oriani's theorem expanded ( Atan(z) + Btanˆ^3(z) + C*tan^5(z) )
• Error function refraction model

Input parameters for the spherical atmosphere models (all but the first):

• Temperature [K]
• Pressure [Pa]
• Relative humidity
• CO2 density [ppm]
• Latitude [deg]
• Height above sea level [m]
• Wavelength(s) [um]
• Zenith angle [deg]