| Calculations of the refractive indices from the visible to far-infrared for Earth and other
planetary atmospheres are presented. The calculations have been performed using a recently
developed fortran code that computes the real part of the refractive indices using as input the
oscillator strengths (location on a wavenumber (wavelength) axis plus the strengths related
to Einstein coefficients, transition moments, etc) from the HITRAN and GEISA
spectroscopic databases. The absorption spectrum is the imaginary part of the refractive
index, which essentially is a Kramers-Kronig transform of the real part. These are
plugged into the numerator and denominator of the standard oscillator formula,
corrected for the Claussius-Mossotti terms. The formulation used in this work is
based on the work by Mathar (Ref. 1) and developed in support of astronomical
observations.
In this paper the effect of the variation of the refraction indices with wavelength and
atmospheric conditions and comparisons with a previously developed model by Collavita et
al. (Ref. 2) will be be discussed.
References:
1. R. Mathar, Applied Optics 43(4), 928-932, 2004.
2. Collavita et al., Publications of the Astronomical Society of the Pacific 116, 876-885,
2004. |