Analysis of atmospheric effects on stellar scintillation

Robert R. Beland; John R. Roadcap

doi:10.1117/12.391876

21 July 2000 Analysis of atmospheric effects on stellar scintillation

Robert R. Beland, John R. Roadcap

Proceedings Volume 4034, Laser Weapons Technology; (2000) https://doi.org/10.1117/12.391876
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

Atmospheric effects on normalized stellar irradiance fluctuations for the weak fluctuation regime are examined. Both monochromatic and polychromatic effects are considered. Calculations are performed using a Rytov theory which explicitly includes refractive effects arising from the polychromatic stellar source. The atmospheric turbulence along the path is specified in a spherical shell or `onion- skin' model using a vertical profile specified by either the Clear 1 model or actual thermosonde measurements. Finite optical bandwidth, receiver aperture size, and variable turbulent inner scale are also included. Good agreement is found between ground-based measurements and model results in the weak scintillation regime. It is also shown that refraction effects can significantly alter the wavelength dependence of scintillation as well as produce a leveling off and decrease of scintillation with increasing zenith angle that could be misinterpreted as saturation.

Citation Download Citation

Robert R. Beland and John R. Roadcap "Analysis of atmospheric effects on stellar scintillation", Proc. SPIE 4034, Laser Weapons Technology, (21 July 2000); https://doi.org/10.1117/12.391876

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