Issue |
A&A
Volume 396, Number 2, December III 2002
|
|
---|---|---|
Page(s) | 723 - 730 | |
Section | Numerical methods and codes | |
DOI | https://doi.org/10.1051/0004-6361:20021323 | |
Published online | 03 December 2002 |
Wavefront outer scale and seeing measurements at San Pedro Mártir Observatory
1
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
2
Instituto de Astronomía UNAM, Apdo. Postal 72-3 (Xangari), 58089 Morelia Mich., México e-mail: r.avila@astrosmo.unam.mx
3
Instituto de Astronomía UNAM, Apdo. Postal 70-264, 04510 México D.F., México e-mail: leonardo@astroscu.unam.mx
4
U.M.R. 6525 Astrophysique, Université de Nice Sophia Antipolis/CNRS, Parc Valrose, 06108 Nice Cedex 2, France e-mail: Aziz.ZIAD@unice.fr, Francois.MARTIN@unice.fr, Julien.BORGNINO@unice.fr
5
Instituto de Astronomía UNAM, Apdo. Postal 877, 22800 Ensenada B. C., México e-mail: harris@astrosen.unam.mx, rmm@astrosen.unam.mx, hiriart@astrosen.unam.mx
Corresponding author: R. Conan, rconan@eso.org
Received:
4
December
2001
Accepted:
10
September
2002
The first measurements of the spatial coherence outer scale at the
Observatorio Astronómico Nacional at San Pedro Mártir (OAN-SPM)
are reported along with long term seeing measurements.
These parameters were measured with the Generalized Seeing Monitor
and with a Differential Image Motion Monitor.
An instrumented mast was also used to measure the structure constant
of the refractive index in the first 15 m.
Log–normal statistics were found for the seeing and for the outer
scale, with median values of
and 27.0 m, respectively.
The distribution of the outer scale values is similar to that
found in other observatories around the world, suggesting
that the presence of trees in the OAN-SPM do not affect the outer scale
values. Correlation studies suggest
that large values of the seeing and the outer scale are likely to occur
when the wind blows from the SSW. Further studies are recommended to
confirm this tendency.
Key words: atmospheric effects / turbulence / site testing / techniques: high angular resolution / instrumentation: adaptive optics
© ESO, 2002
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