G.S.M: A Grating Scale Monitor for atmospheric turbulence measurements. II. First measurements of the wavefront outer scale at the O.C.A.

Details G.S.M: A Grating Scale Monitor for atmospheric turbulence measurements. II. First measurements of the wavefront outer scale at the O.C.A. G.S.M: A Grating Scale Monitor for atmospheric turbulence measurements. II. First measurements of the wavefront outer scale at the O.C.A.

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..109..557a&link_type=abstract

Astronomy and Astrophysics Suppl. 109, 557-562 (1995)

Astronomy and Astrophysics

Astrophysics

13

Atmospheric Effects, Methods: Observational, Site Testing

Scientific paper

The spatial and temporal properties of atmospherically degraded wavefronts are relevant for high angular resolution techniques like adaptive optics or long baseline interferometry. The wavefront outer scale has been estimated on two sites by a new instrument described in the previous paper. The normalized covariance of angle of arrival fluctuations at two wavefront points separated by a variable distance from 0.14 m to 10 m is measured and compared to theoretical set of curves computed in the framework of Von Karman or Greenwood-Tarazano turbulence models. At the Calern site of Observatoire de la Cote d'Azur (O.C.A.) G.S.M. was installed near the long-baseline interferometer GI2T. The results from two nights show that in stable seeing conditions, and taking in account the models, the normalized angle of arrival covariance corresponds to turbulence outer scale L_0_ = 300 m. Systematic deviation from the models was observed on another night, corresponding to L_0_ from 10 m to 300 m. Similar results were obtained on two nights at the Mont Gros site of O.C.A., giving L_0_ = 50 m. Extensions of the technique and plans are briefly discussed.

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