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Proceedings Paper

Vertical structure of the turbulence above the observatories of the Canary Islands: parameters and statistics for adaptive optics
Author(s): Jesus J. Fuensalida; Sergio Chueca; Jose Miguel Delgado; Begona Garcia-Lorenzo; Jose M. Rodriguez-Gonzalez; Claudia Karin Hoegemann; Esteban Gonzales Mendizabal; Marcos Reyes; Manuel Verde; Jean Vernin
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Paper Abstract

The statistics of vertical structure of the turbulence affect the complexity of the design and implementation of Multi-Conjugate Adaptive Optics (MCAO) systems. The operation of these systems could be optimized if the stability of the layers were such as to permit to fix the deformable mirrors (DMs) at specific heights. Moreover, it is desirable to know the effects on the placement of the DMs and the gain of the isoplanatic angle in terms of site characterization. From the turbulence profiles measured with the G-SCIDAR technique we have analyzed the statistics of the heights of the DMs and the resulting isoplanatic angles. These results are based on the data from a long ongoing campaign at Roque de los Muchachos Observatory (La Palma) and Teide Observatory (Tenerife) with the highest statistical coverage to date. We have used two ideal MCAO systems, consisting of two and three DMs, and, from a specific comparison in simultaneous measurements over two nights, we show the evolution of the position of DMs and isoplanatic angles in both sites, which can sporadically reach values greater than 60" in 500 nm. We also study the effects of the stability of the conjugate planes on the improvements in the isoplanatic angles.

Paper Details

Date Published: 25 October 2004
PDF: 9 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004);
Show Author Affiliations
Jesus J. Fuensalida, Instituto de Astrofisica de Canarias (Spain)
Sergio Chueca, Instituto de Astrofisica de Canarias (Spain)
Jose Miguel Delgado, Instituto de Astrofisica de Canarias (Spain)
Begona Garcia-Lorenzo, Instituto de Astrofisica de Canarias (Spain)
Jose M. Rodriguez-Gonzalez, Instituto de Astrofisica de Canarias (Spain)
Claudia Karin Hoegemann, Instituto de Astrofisica de Canarias (Spain)
Esteban Gonzales Mendizabal, Instituto de Astrofisica de Canarias (Spain)
Instituto Nacional de Astrofisica, Optica y Electronica (Mexico)
Marcos Reyes, Instituto de Astrofisica de Canarias (Spain)
Manuel Verde, Instituto de Astrofisica de Canarias (Spain)
Jean Vernin, LUAN, CNRS and Univ. de Nice Sophia Antipolis (France)

Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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