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Proceedings Paper

Towards a reliability assessment of the CN2 and wind speed vertical profiles retrieved from GeMS
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Paper Abstract

The advent of a new generation of Adaptive Optics systems called Wide Field AO (WFAO) mark the beginning of a new era. By using multiple Guide Stars (GSs), either Laser Guide Stars (LGSs) or Natural Guide Stars (NGSs), WFAO significantly increases the field of view of the AO-corrected images, and the fraction of the sky that can benefit from such correction. Different typologies of WFAO have been studied over the past years. They all require multiple GSs to perform a tomographic analysis of the atmospheric turbulence. One of the fundamental aspects of the new WFAO systems is the knowledge of the spatio-temporal distribution of the turbulence above the telescope. One way to get to this information is to use the telemetry data provided by the WFAO system itself. Indeed, it has been demonstrated that WFAO systems allows one to derive the C2 N and wind profile in the main turbulence layers (see e.g. Cortes et al. 20121). This method has the evident advantage to provide information on the turbulence stratification that effectively affects the AO system, property more difficultly respected by independently vertical profilers. In this paper, we compare the wind speeds profiles of GeMS with those predicted by a non-hydrostatical mesoscale atmospherical model (Meso-NH). It has been proved (Masciadri et al., 20132), indeed, that this model is able to provide reliable wind speed profiles on the whole troposphere and stratosphere (up to 20-25 km) above top-level astronomical sites. Correlation with measurements revealed to be very satisfactory when the model performances are analyzed from a statistical point of view as well on individual nights. Such a system appears therefore as an interesting reference to be used to quantify the GeMS wind speed profiles reliability.

Paper Details

Date Published: 4 August 2014
PDF: 10 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 914863 (4 August 2014); doi: 10.1117/12.2056131
Show Author Affiliations
Benoît Neichel, Lab. d'Astrophysique de Marseille, CNRS, Aix Marseille Univ. (France)
Elena Masciadri, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Andres R. Guesalaga, Pontificia Univ. Católica de Chile (Chile)
Franck Lascaux, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Clémentine Béchet, Pontificia Univ. Católica de Chile (Chile)

Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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