EDP Sciences
Free Access
Issue
A&A
Volume 369, Number 1, April I 2001
Page(s) 364 - 372
Section Instruments, observational techniques and data processing
DOI https://doi.org/10.1051/0004-6361:20010134


A&A 369, 364-372 (2001)
DOI: 10.1051/0004-6361:20010134

Atmospheric turbulence and wind profiles monitoring with generalized scidar

R. Avila1, J. Vernin2 and L. J. Sánchez3

1  Instituto de Astronomía UNAM, Apdo. Postal 72-3 (Xangari), 58089 Morelia Mich., México
2  UMR 6525 Astrophysique, Université de Nice Sophia Antipolis/CNRS, Parc Valrose, 06108 Nice Cedex 2, France
    e-mail: Jean.VERNIN@unice.fr
3  Instituto de Astronomía UNAM, Apdo. Postal 70-264, 04510 México D.F., México
    e-mail: leonardo@astroscu.unam.mx

(Received 28 August 2000 / Accepted 12 December 2000 )

Abstract
We present a method for simultaneous measurement of the vertical distribution of the optical turbulence strength $C_{\rm N}^2(h) $ and wind velocity ${\vec V}(h)$ in the Earth's atmosphere, based on an analysis of spatio-temporal correlations of stellar scintillation images obtained with generalized scidar. A statistical comparison of ${\vec V}(h)$ obtained with this method and instrumented balloons supports the use of this method. The algorithm used allows for the identification of dome seeing, which can be subtracted from $C_{\rm N}^2(h) $, to obtain a turbulence profile free of dome contribution. Examples of simultaneous $C_{\rm N}^2(h) $ and ${\vec V}(h)$ monitorings are presented.


Key words: atmospheric effects -- turbulence -- site testing -- methods: data analysis -- instrumentation: adaptive optics

Offprint request: R. Avila, r.avila@astrosmo.unam.mx




© ESO 2001