Ground-based solar astrometric measurements during the PICARD mission

A. Irbah; M. Meftah; T. Corbard; R. Ikhlef; F. Morand; P. Assus; M. Fodil; M. Lin; E. Ducourt; P. Lesueur; G. Poiet; C. Renaud; M. Rouze

doi:10.1117/12.898301

10 October 2011 Ground-based solar astrometric measurements during the PICARD mission

A. Irbah, M. Meftah, T. Corbard, R. Ikhlef, F. Morand, P. Assus, M. Fodil, M. Lin, E. Ducourt, P. Lesueur, G. Poiet, C. Renaud, M. Rouze

Author Affiliations +

Proceedings Volume 8178, Optics in Atmospheric Propagation and Adaptive Systems XIV; 81780A (2011) https://doi.org/10.1117/12.898301
Event: SPIE Remote Sensing, 2011, Prague, Czech Republic

Abstract

PICARD is a space mission developed mainly to study the geometry of the Sun. The satellite was launched in June 2010. The PICARD mission has a ground program which is based at the Calern Observatory (Observatoire de la C^ote d'Azur). It will allow recording simultaneous solar images from ground. Astrometric observations of the Sun using ground-based telescopes need however an accurate modelling of optical e®ects induced by atmospheric turbulence. Previous works have revealed a dependence of the Sun radius measurements with the observation conditions (Fried's parameter, atmospheric correlation time(s) ...). The ground instruments consist mainly in SODISM II, replica of the PICARD space instrument and MISOLFA, a generalized daytime seeing monitor. They are complemented by standard sun-photometers and a pyranometer for estimating a global sky quality index. MISOLFA is founded on the observation of Angle-of-Arrival (AA) °uctuations and allows us to analyze atmospheric turbulence optical e®ects on measurements performed by SODISM II. It gives estimations of the coherence parameters characterizing wave-fronts degraded by the atmospheric turbulence (Fried's parameter, size of the isoplanatic patch, the spatial coherence outer scale and atmospheric correlation times). This paper presents an overview of the ground based instruments of PICARD and some results obtained from observations performed at Calern observatory in 2011.

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A. Irbah, M. Meftah, T. Corbard, R. Ikhlef, F. Morand, P. Assus, M. Fodil, M. Lin, E. Ducourt, P. Lesueur, G. Poiet, C. Renaud, and M. Rouze "Ground-based solar astrometric measurements during the PICARD mission", Proc. SPIE 8178, Optics in Atmospheric Propagation and Adaptive Systems XIV, 81780A (10 October 2011); https://doi.org/10.1117/12.898301

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