nlambda

sofia_redux.spectroscopy.nlambda.nlambda(wavelength, pressure, temperature, water=0.0)

Compute the real part of the refractive index of air.

Based on the formulas in Filippenko’s article in 1982, PASP, 94, 715.

Parameters:

wavelengthfloat or numpy.ndarray of float (N,)

Wavelength of light in microns

pressurefloat or numpy.ndarray of float (N,)

Atmospheric pressure in mm of Hg

temperaturefloat or numpy.ndarray of float (N,)

Atmospheric temperature in degrees Celsius

waterfloat of numpy.ndarray (N,), optional

Water vapour pressure in mm of Hg

Returns:

index_of_refractionfloat or numpy.ndarray of float (N,)

The index of refraction for the input conditions