Atmospheric Refraction: Converting Density Profiles to Refractivity

AI Thread Summary
The discussion centers on converting a density profile from the 1976 US Standard Atmosphere into a refractivity index profile for a project on the Green Flash. The user seeks a mathematical formula for this conversion, noting that refractive indices depend on density changes influenced by temperature and altitude. A suggestion is made to refer to the Ciddor equation for guidance on the conversion process. A link to a relevant document is provided for further reference. The conversation highlights the need for precise formulas in atmospheric studies.
natski
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Hi,

I'm working on a project on the Green Flash and have so far been building up a program to produce the 1976 US Standard Atmosphere. I have produced the density profile for the first 86km (which I'll assume to be enough for now) and now need to convert it to a refractivity index profile.

I'm assuming refractive indices only depend on density changes (since density depends on both temperature and altitude). My question is what mathematical formula should I use? I have been unable to find a formula for converting density profiles into refactive index profiles.

Thanks,

Natski
 
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You probably should look for Ciddor equation. EDIT: http://www.cfa.harvard.edu/~jbattat/apollo/references/atmosphere/chambers_astrometryWithPanStarrsAndPS1_pushingTheLimitsOfAtmosphericRefraction_2005.pdf , page 8
 
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