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@@ -54,7 +54,7 @@ pip install AstroAtmosphere
``` ```
##Contents of the AstroAtmosphere package ## Contents of the AstroAtmosphere package
The package contains the following files: The package contains the following files:
- `/data/1976USSA.txt` : Data file of the 1976 US Standard Atmosphere. - `/data/1976USSA.txt` : Data file of the 1976 US Standard Atmosphere.
@@ -65,7 +65,7 @@ The package contains the following files:
- `refractivityModels.py` : Contains various functions from literature to calculate the refractive index. Some examples of works included are Ciddor (1996), Barrell & Sears (1939), SLALIB, Owens (1967) and Edlen (1966). - `refractivityModels.py` : Contains various functions from literature to calculate the refractive index. Some examples of works included are Ciddor (1996), Barrell & Sears (1939), SLALIB, Owens (1967) and Edlen (1966).
##The Ciddor refractivity model ## The Ciddor refractivity model
The refractivity model from Ciddor, 1996, calculates the index of refraction of air using the following parameters: The refractivity model from Ciddor, 1996, calculates the index of refraction of air using the following parameters:
- T - Temperature in Kelvin - T - Temperature in Kelvin
@@ -83,7 +83,7 @@ n = at.n_tph(l=0.55, T=273.15, p=101325, RH=0.2, xc=300)
Basic functionality of other refractivity models is included as well and is discussed below. Basic functionality of other refractivity models is included as well and is discussed below.
##The atmospheric refraction and atmospheric dispersion models ## The atmospheric refraction and atmospheric dispersion models
If the atmospheric refraction is denoted as R(n), then atmospheric dispersion is defined as R(n1) - R(n2). Thus they are very similar in function and also in use. If the atmospheric refraction is denoted as R(n), then atmospheric dispersion is defined as R(n1) - R(n2). Thus they are very similar in function and also in use.
@@ -122,7 +122,7 @@ atm_ref = ref.cassini(n, zenith=30)
``` ```
##Analytical error propagation ## Analytical error propagation
Full analytical error propagation is available for the Ciddor dispersion model (`Observatory.dn_tph()`), for the Cassini refraction model (`refraction.cassiniError()`) and for the Cassini dispersion model (`dispersion.cassiniError()`). Full analytical error propagation is available for the Ciddor dispersion model (`Observatory.dn_tph()`), for the Cassini refraction model (`refraction.cassiniError()`) and for the Cassini dispersion model (`dispersion.cassiniError()`).
The results agree well with a Monte Carlo simulation, suggesting that if additional errors have not been considered, they are of neglible importance. The results agree well with a Monte Carlo simulation, suggesting that if additional errors have not been considered, they are of neglible importance.
@@ -173,7 +173,7 @@ dispersion_unc = disp.cassiniError(zenith_obs, l1, l2, T, P, H, xc,
dl1=0.001, dl2=0.001, dT=0.2, dP=30, dRH=0.03, dCO2=25, dz=1/3600) * 3.6e6 dl1=0.001, dl2=0.001, dT=0.2, dP=30, dRH=0.03, dCO2=25, dz=1/3600) * 3.6e6
``` ```
##Other refractivity models ## Other refractivity models
The package also includes limited functionality of other refractivity models. These are not as extensive, work only under standard atmospheric conditions, or over a limited wavelength range, compared to the Ciddor model. The package also includes limited functionality of other refractivity models. These are not as extensive, work only under standard atmospheric conditions, or over a limited wavelength range, compared to the Ciddor model.
@@ -192,7 +192,7 @@ Included are
The last function extracts the refractive index from the `pyslalib.sla_refro()` function and thus requires [pyslalib](https://pypi.org/project/pySLALIB/). This is an optional dependency for the setup of AstroAtmosphere. The last function extracts the refractive index from the `pyslalib.sla_refro()` function and thus requires [pyslalib](https://pypi.org/project/pySLALIB/). This is an optional dependency for the setup of AstroAtmosphere.
##Quick functions ## Quick functions
Some functions that assume default conditions for the atmosphere. Then only the wavelength and zenith angle are required to calculate the refraction and dispersion. Some functions that assume default conditions for the atmosphere. Then only the wavelength and zenith angle are required to calculate the refraction and dispersion.