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Proceedings Paper

A dedicated tool for a full 3D Cn^2 investigation
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Paper Abstract

In this contribution we present how the mesoscale model Meso-Nh model together with the Astro-Meso-Nh and a set of diagnostic tools allow for a full 3D investigation of the C2N and derived integrated astroclimatic parameters. The possibility to study simultaneously 3D fields of meteorological and astroclimatic parameters permits us to provide a comprehensive understanding of the characteristics of the atmospheric flow as well as the physical mechanisms that produce them. To illustrate the different diagnostics and their potentialities, we investigated one night and looked at instantaneous fields of meteorologic and astroclimatic parameters. To show the potentialities of this tool for applications in an Observatory we ran the model above sites with very different optical turbulence (OT) distributions: the antarctic plateau (Dome C, Dome A, South Pole) and a mid-latitude site (Mt. Graham, Arizona). We put particular emphasis on the 2D maps of integrated astroclimatic parameters (such as seeing, isoplanatic angles, ...) and to the possibility to calculate them in different slabs (having what ever thickness) at different heights in the troposhere. The latter option is particularly useful for the seeing. For this reason this is an useful tool of prediction and investigation of the turbulence structure and it can support the optimization of the AO, GLAO and MCAO systems running at the focus of the ground-based telescopes. The examples we provide put clearly in evidence that different astroclimatic sites present different OT behaviors. Besides, our tool allowed us for discriminating these sites.

Paper Details

Date Published: 6 August 2010
PDF: 8 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77334E (6 August 2010); doi: 10.1117/12.856900
Show Author Affiliations
Franck Lascaux, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Elena Masciadri, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Susanna Hagelin, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Uppsala Univ. (Sweden)

Published in SPIE Proceedings Vol. 7733:
Ground-based and Airborne Telescopes III
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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