Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasp..119..669e&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 119, Issue 856, pp. 669-686.
Astronomy and Astrophysics
Astronomy
19
Atmospheric Phenomena And Seeing
Scientific paper
We present the results of optical turbulence measurements conducted with a Generalized SCIDAR (scintillation detection and ranging) at Mount Graham during 16 nights in 2004 and 2005 at the Vatican Advanced Technology Telescope. The principle of the data reduction process is shown, as is the validation of the obtained results. From the measured C2N and wind speed profiles, the astroclimatic parameters, such as seeing ɛ0, isoplanatic angle ϑ0, wave-front coherence time τ0, and isopistonic angle ϑP, are calculated, and their seasonal variation is studied. With subtraction of the dome seeing, we obtained median values for ɛ0 (0.67"), ϑ0 (2.7"), τ0 (3.6 ms), and ϑP (3.3") that indicate that the astronomical seeing at Mount Graham is comparable to the best sites in the world. The seasonal variation of the vertical structure of the C2N profiles is studied, and the contribution by the ground-layer turbulence is analyzed. Furthermore, typical discretized C2N profiles that are suitable for numerical simulations are determined.
Egner Sebastian E.
Masciadri Elena
McKenna Dan
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