Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-31
Astronomy and Astrophysics
Astrophysics
To appear in the Publications of the Astronomical Society of the Pacific (PASP). Note: Figures are low resolution versions due
Scientific paper
10.1086/496939
The site survey for the Advanced Technology Solar Telescope concluded recently after more than two years of data gathering and analysis. Six locations, including lake, island and continental sites, were thoroughly probed for image quality and sky brightness. The present paper describes the analysis methodology employed to determine the height stratification of the atmospheric turbulence. This information is crucial because day-time seeing is often very different between the actual telescope aperture (~30 m) and the ground. Two independent inversion codes have been developed to analyze simultaneously data from a scintillometer array and a solar differential image monitor. We show here the results of applying them to a sample subset of data from May 2003, which was used for testing. Both codes retrieve a similar seeing stratification through the height range of interest. A quantitative comparison between our analysis procedure and actual in situ measurements confirms the validity of the inversions. The sample data presented in this paper reveal a qualitatively different behavior for the lake sites (dominated by high-altitude seeing) and the rest (dominated by near-ground turbulence).
Beckers Jacques
Brandt Patrick
Briggs John
Brown Tim
Brown Warren
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