Skip to Main content Skip to Navigation
Theses

CONTRIBUTION À L'ÉTUDE DES SITES ASTRONOMIQUES PAR MODÉLISATION ET EXPÉRIMENTATION in situ : APPLICATION AUX SITES DE LA SILLA ET DU DÔME C POUR LES TELESCOPES GÉANTS DU FUTUR

Abstract : This thesis was undertaken within the framework of the E-ELT project (European Extremely Large Telescope) where the site characterization for the future large telescopes is the paramount goal. The very important factor for astronomical observations is the atmospheric turbulence. Several techniques exist to measure the various integral parameters and the vertical profiles of optical turbulence. In this context I analyzed the various atmospheric profiling techniques applied to two astronomical sites : La Silla one ESO site in Chile and also the Antarctic site of the Dome C, which has been of great interest for the astronomers during the past few years. Therefore, the feasibility must be extensively studied, and proceed through an objective analysis of pros and cons.
In the first part of my thesis, I review some important properties of Antarctic plateau. Then, I consider its geographical position and natural conditions that bring important advantages for astronomical observations at different wavelengths, and especially in the IR. Later, for understanding the seasonal behavior of the atmosphere above Dome C, the climatological situation, using the year-round data from the ECMWF (European Center for Medium-range Weather Forecasts) model for 2003-2004, is then presented. The results from the model are finally compared to the results already obtained from site testing campaigns at Concordia.
In the second part of my thesis, I present vertical profiles of refractive index structure constant Cn2(h) measurements made at the 1-m telescope at La Silla Observatory (ESO, Chile) using the Generalized SCIDAR. Observations took place from July 2002 up to February 2003. I performed the data processing of 600Gb scintillation images to retrieve Cn2(h) and V(h) profiles using Maximum Entropy and Tikhonov Regularization inversion methods. Seeing values derived from C2n(h) profiles are successfully compared to the simultaneous seeing measurements taken with a DIMM. Five months statistics of the turbulent situation at La Silla Observatory are analyzed for the general qualification of the potential sites for the E-ELT project.
Complete list of metadatas

Cited literature [86 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00271689
Contributor : Tatyana Sadibekova <>
Submitted on : Wednesday, April 9, 2008 - 11:24:28 PM
Last modification on : Tuesday, May 26, 2020 - 6:50:09 PM
Long-term archiving on: : Thursday, May 20, 2010 - 8:44:32 PM

Identifiers

  • HAL Id : tel-00271689, version 1

Collections

Citation

Tatiana Sadibekova. CONTRIBUTION À L'ÉTUDE DES SITES ASTRONOMIQUES PAR MODÉLISATION ET EXPÉRIMENTATION in situ : APPLICATION AUX SITES DE LA SILLA ET DU DÔME C POUR LES TELESCOPES GÉANTS DU FUTUR. Planète et Univers [physics]. Université Nice Sophia Antipolis, 2007. Français. ⟨tel-00271689⟩

Share

Metrics

Record views

435

Files downloads

705