First evidence of the finite horizontal extent of the optical turbulence layers. 
Implications for new adaptive optics techniques

Masciadri, E.; Ávila, Raúl; Sánchez, L. J.

doi:10.1051/0004-6361:20011622

Cited by 26 publications

(36 citation statements)

References 22 publications

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“…It has been shown previously that such dependences can exist 29 and some preliminary investigation for Mauna Kea 13N using TMT data were done. It turns out that the TMT data do not cover a sufficiently large range of zenith and azimuth angles for this purpose and that, ideally, simultaneous measurements with several instruments pointing in different directions should be used.…”

Section: Higher Resolution Profilesmentioning

confidence: 90%

Open questions in site characterization and turbulence parameter measurements

et al. 2010

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With the development of increasingly larger and more complex telescopes and instrumentation, site testing and characterization efforts also increase in both magnitude and complexity. This happens because the investment into larger observatories is higher and because new technologies, such as adaptive optics, require knowledge about parameters that did not matter previously, such as the vertical distribution of turbulence. We present examples of remaining questions which, to date, are not generally addressed by "standard" site characterization efforts, either because they are technically not (yet) feasible or because they are impractical. We center our observations around the experience gained during the Thirty Meter Telescope (TMT) site testing effort with an emphasis on turbulence measurements, but our findings are applicable in general to other current and future projects as well.

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Section: Higher Resolution Profilesmentioning

confidence: 90%

Open questions in site characterization and turbulence parameter measurements

et al. 2010

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“…We imagine that we h a ve a GCM model extended over the whole globe and having a horizontal resolution of about 100 km. We cut a domain in a region around a telescope having an extent of the order of a few tens of kilometers and a horizontal resolution of about 500 m: this is our orographic model (see for example Fig.1 in Masciadri et al 25 ).…”

Section: Methods For Simulating the Optical Turbulencementioning

confidence: 99%

“…How can we estimate, in the best way, the P and P parameters ? 16 ). 10 nights of measurements provided by a GS and balloons were considered.…”

Section: Score Of Success Of the Numerical Techniquementioning

confidence: 99%

Mesoscale atmospherical model for a 3D optical turbulence characterization in astronomy

Masciadri¹

2003

SPIE Proceedings

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The characterization of the optical turbulence (OT) should be considered as one of the most important c hallenges related to the ELTs feasibility. During the past few years it was proved that the limitations of the adaptive optics techniques due to the turbulence change as the AO techniques evolve. For this reason, it would be useful to develop a exible tool that could characterize the turbulence in an exhaustive w ay and that permits, at the same time, relatively simple adaptations in order to satisfy new requirements of the AO techniques and the site testing. In this contribution I will talk about the usefulness of meso-scale atmospherical models for a 3D characterization of the optical turbulence. I will present the principal potentialities of the numerical technique in the astronomical context and the di erent methods that can be employed to simulate the OT. I will present the progress obtained in OT simulations using the 'Meso-Nh' model on some of the best observatories in the world: Cerro Paranal (Chile), Roque de Los Muchachos (Canary Islands) and San Pedro M artir (M exico). I will show w h i c h is the score of success presently attained with the numerical technique and I will try to sketch how s u c h s i m ulations could be a useful support for AO techniques. Finally, I will talk about applications of the model to the selection of astronomical sites for the ELTs.

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“…Echevarría et al (1998) reported a median open air seeing of 0.61 arcsec, obtained during an extensive (3-years) seeing campaign, using non-differential seeing monitors. Masciadri et al (2002) presented evidence of a finite horizontal extension of turbulence layers at the site.…”

Section: The Observatory Sitementioning

confidence: 97%

Wavefront outer scale and seeing measurements at San Pedro Mártir Observatory

Conan

Ávila²,

Sánchez³

et al. 2002

A&A

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Abstract. 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 C 2 n in the first 15 m. Log-normal statistics were found for the seeing and for the outer scale, with median values of 0.92 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.

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First evidence of the finite horizontal extent of the optical turbulence layers. Implications for new adaptive optics techniques

Cited by 26 publications

References 22 publications

Open questions in site characterization and turbulence parameter measurements

Open questions in site characterization and turbulence parameter measurements

Mesoscale atmospherical model for a 3D optical turbulence characterization in astronomy

Wavefront outer scale and seeing measurements at San Pedro Mártir Observatory

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