Method of estimating time scales of the atmospheric piston and its application at Dome C (Antarctica)

Aglae Kellerer (1) , Marc Sarazin (2) , Vincent Coudé Du Foresto (1) , Karim Agabi (3) , Eric Aristidi (3) , Tatyana Sadibekova (4) , Vincent Coudé Du Foresto (5)

1 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
2 ESO - European Southern Observatory
3 LAGRANGE - Joseph Louis LAGRANGE
4 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
5 LESIA (UMR_8109) - Laboratoire d'études spatiales et d'instrumentation en astrophysique

Analysis of the first interferometric fringes recorded at Dome C, Antarctica are presented. Measurements were taken 31 January and 1 February 2005 during daytime. Our purpose in performing the analysis was to measure temporal fluctuations of the atmospheric piston, which are critical for interferometers, and determine their sensitivity. These scales are derived through the motion of the image that is formed in the focal plane of a Fizeau interferometer. We could establish a lower limit to the coherence time by studying the decay rate of correlation between successive fringes. Coherence times are measured to be larger than 10 ms, i.e., at least three times higher than the median coherence time measured at the site of Paranal (3.3 ms).

Mots clés: Atmospheric and ocean optics; Instrumentation; measurement; and metrology

Domaines: Astrophysique [astro-ph]

Aglae Kellerer, Marc Sarazin, Vincent Coudé Du Foresto, Karim Agabi, Eric Aristidi, et al.. Method of estimating time scales of the atmospheric piston and its application at Dome C (Antarctica). Applied optics, 2006, 45 (22), pp.5709. ⟨10.1364/AO.45.005709⟩. ⟨hal-02455074⟩