Issue |
A&A
Volume 524, December 2010
|
|
---|---|---|
Article Number | A73 | |
Number of page(s) | 8 | |
Section | Astronomical instrumentation | |
DOI | https://doi.org/10.1051/0004-6361/201015178 | |
Published online | 24 November 2010 |
Multi-instrument measurement campaign at Paranal in 2007
Characterization of the outer scale and the seeing of the surface layer
1
OCA. CNRS UMR 6525 Hippolyte FIZEAU, Université de Nice-Sophia
Antipolis,
Campus Valrose,
06108
Nice Cedex 2,
France
e-mail: daliali@unice.fr
2
European Southern Observatory, Karl-Schwarzschild-Str.2, 85748
Garching,
Germany
3
Instituto de Astrofísica de Canarias via Lactea s/n,
38200 La Laguna,
Tenerife,
Spain
4
Cerro Tololo Inter-American Observatory,
Casilla 603
La Serena,
Chile
5
Département de Physique, Université de Montréal,
C.P. 6128,
Succ. Centre-Ville,
Montreal, QC, H3C
3J7, Canada
Received:
8
June
2010
Accepted:
5
September
2010
Aims. Within the framework of site qualification for the future European large telescope E-ELT, a campaign of measurements was carried out for ten nights in December 2007 at Paranal using six independent instruments.
Methods. To characterize the optical turbulence, two techniques were used: the statistical analysis of the fluctuations of the angle of arrival and the scintillation of the observed objects which are, in this case, a single star for DIMM, GSM, and MASS, a double star for Cute-SCIDAR, and Moon limb for MOSP and LuSci.
Results. The optical parameters measured in this campaign and presented
here are the seeing, the isoplanatic angle, the coherence time, and the outer scale. We
obtain a good agreement with the value measured in previous campaigns. We also extracted
the vertical profile of the turbulence given by , and the profiles of the outer scale for the
first time at Paranal. A comparison of the different results that we present here allows
the determination of the energy distribution in the free atmosphere, on the ground layer
as well as in the first meters above ground. This reveals a significant contribution of
the surface layer to the degradation of the global seeing.
Key words: instrumentation: detectors / atmospheric effects / site testing / methods: data analysis / techniques: high angular resolution
© ESO, 2010
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