MISOLFA: a generalized monitor for daytime spatio-temporal turbulence characterization

Rabah Ikhlef 1 Thierry Corbard 1 Frédéric Morand 1 Catherine Renaud 1 Maamar Fodil 2 Aziz Ziad 1 Julien Borgnino 1 Mustapha Meftah 3 Pierre Assus 1 Bertrand Chauvineau 1 Alain Hauchecorne 3 Patrick Lesueur 4 Germain Poiet 4 Fabrice Ubaldi 1 Mohammed Hamadouche 5 Toufik Abdelatif 2
1 LAGRANGE - Joseph Louis LAGRANGE
2 CRAAG - Centre de Recherche en Astronomie Astrophysique et Géophysique
3 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
4 LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
5 Université M'hamed Bougara de Boumerdes, Unité de Recherche Matériaux, Procèdes et Environnement UR- MPE, Algérie - UR- MPE
Abstract : Ground based solar observations are strongly affected by optical turbulence. The concept of a new instrument which allows to measure both spatial and temporal parameters of atmospheric turbulence has been proposed in the late 90s. The instrument MISOLFA (Moniteur d'Images Solaire Franco-Algérien) is based on this concept and has been developped over the past ten years in the framework of a ground-based solar astrometry program and in parallel to the developpement of several night time turbulence monitors at Calern Observatory, south of France. In this paper we first describe its instrumental concept, the technical choices that were made to meet the specifications and discuss the difficulties encountered. Using numerical simulations, we present and test the methods that can be used in order to estimate the turbulence parameters from both MISOLFA image and pupil planes. The effect of finite outer scale on Fried parameter estimation from a simple estimate of the Angle-of-Arrival variance is clearly shown. Finally we present the first results obtained with the instrument fully operating in its two observing planes. We obtained a mean value of Angle-of-Arrival coherence time of 5.3 ms and good agreement is found between spatial parameters obtained with image and pupil planes.
Keywords : Atmospheric effects Sun Site testing Telescopes
Document type :
Journal articles
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https://hal-insu.archives-ouvertes.fr/insu-01275104
Contributor : Catherine Cardon <>
Submitted on : Tuesday, February 16, 2016 - 5:16:48 PM
Last modification on : Friday, January 31, 2020 - 10:38:11 AM

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INSU | CNRS | UNICE | OCA | UPMC | UVSQ | LATMOS | LAGRANGE | UNIV-PARIS-SACLAY | UNIV-COTEDAZUR | SORBONNE-UNIVERSITE | SU-SCIENCES

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Rabah Ikhlef, Thierry Corbard, Frédéric Morand, Catherine Renaud, Maamar Fodil, et al.. MISOLFA: a generalized monitor for daytime spatio-temporal turbulence characterization. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2016, 458 (1), pp.517-530. ⟨10.1093/mnras/stw242⟩. ⟨insu-01275104⟩

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