Measurements of optical turbulence in the free atmosphere above Mount Maidanak in 2005–2007

Kornilov, V.; Ilyasov, Sabit; Vozyakova, O. V.; Tillaev, Yu. A.; Safonov, Boris; Ibragimov, M. A.; Shatsky, N. I.; Egamberdiev, Sh. A.

doi:10.1134/s1063773709080040

Cited by 14 publications

(21 citation statements)

References 17 publications

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“…To investigate the atmospheric limit of photometric accuracy, the data of the measurements performed on the mountain Maidanak in 2005 -2007 with the MASS instrument were used (Kornilov et al, 2009). The variances σ 2 for all apertures were calculated with help of the mean square difference of adjacent 1-s means…”

Section: Calculation Of the S 3 Indexmentioning

confidence: 99%

The statistics of the photometric accuracy based on MASS data and the evaluation of high-altitude wind

Kornilov¹

2011

Astron. Lett.

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The effect of stellar scintillation on the accuracy of photometric measurements is analyzed. We obtain a convenient form of estimaton of this effect in the long exposure regime, when the turbulence shift produced by the wind is much larger than the aperture of the telescope. A simple method is proposed to determine index S 3 introduced by Kenyon et al. (2006), directly from the measurements with the Multi Aperture Scintillation Sensor (MASS) without information on vertical profile of the wind. The statistics S 3 resulting from our campaign of 2005 -2007 at Maidanak observatory is presented. It is shown that these data can be used to estimate high-altitude winds at pressure level 70 -100 mbar. Comparison with the wind speed retrieved from the NCEP/NCAR global models shows a good agreement. Some prospects for retrieval of the wind speed profile from the MASS measurements are outlined.

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Section: Calculation Of the S 3 Indexmentioning

confidence: 99%

The statistics of the photometric accuracy based on MASS data and the evaluation of high-altitude wind

Kornilov¹

2011

Astron. Lett.

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“…The maximal difference is observed in 1 km layer but it doesn't exceed 3 · 10 −15 m 1/3 . Both curves are similar to the cumulative distribution in paper [7] which was obtained with algorithm P. The behavior of residuals R 2 obtained for the correctly weighted system (5) is given on the right-hand plot of Fig. 4.…”

Section: Solutions and Their Errors For Algorithms N1 And N2mentioning

confidence: 62%

The revision of the turbulence profiles restoration from MASS scintillation indices

Kornilov¹,

Kornilov²

2011

Exp Astron

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The altitude distribution of optical turbulence is derived from the MASS instrument data by solving an inverse problem. In this paper, some modifications of the profile restoration are described. The principal change is the introduction of the Non Negative Least Squares algorithm which has good regularizing properties. An averaging of scintillation indices was replaced with averaging of obtained solutions what leads to clearer physical results. It is shown that restoration with a number of turbulent layers as large as 14-15 can be successfully performed.

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“…For example, our MASS measurements at Maidanak (Kornilov et al 2009) derived a characteristic θ 0 of 2.19 arcsec, varying seasonally from 1.92–2.35 arcsec. Els et al (2009) and Tokovinin & Travouillon (2006) list θ 0 = 1.56 and 2.22 arcsec for Cerro Tololo and Cerro Pachon, respectively.…”

Section: Turbulence Measurement Resultsmentioning

confidence: 96%

“…An optimal solution for this task is to install an automatic site‐testing monitor that functions with no regular operator intervention. The need for such a robotic facility is supported by both our own experience at Mt Maidanak (Kornilov et al 2009) in Uzbekistan and our colleagues’ practice.…”

Section: Automatic Site Monitormentioning

confidence: 92%

“…Therefore each focusing of the Fabry lens was followed by the measurement of k with 1–2 per cent precision ( k = 16.3 in the final state). Since functions Q ( z ) also involve chromatic effects and thus depend on the spectral response of MASS detectors, the latter was controlled 8 by special observations of stars with a wide range of colours, similarly to the technique of Kornilov et al (2009).…”

Section: Optical Turbulence Measurementmentioning

confidence: 99%

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First results of a site-testing programme at Mount Shatdzhatmaz during 2007-2009

Kornilov¹,

Shatsky²,

Voziakova³

et al. 2010

Monthly Notices of the Royal Astronomical Society

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We present the first results of site testing performed at Mt Shatdzhatmaz in the Northern Caucasus, where the new Sternberg Astronomical Institute 2.5-m telescope will be installed. An automatic site-monitor instrumentation and functionality are described, together with the methods of measurement of the basic astroclimate and weather parameters. The clear night-sky time derived on the basis of 2006-2009 data amounts to 1340 h per year.Principal attention is given to measurement of the optical-turbulence altitude distribution, which is the most important characteristic affecting the performance of optical telescopes. For the period from more than 85 000 turbulence profiles were collected using the combined Multi Aperture Scintillation Sensor and Differential Image Motion Monitor (MASS/DIMM) instrument. The statistical properties of the turbulent atmosphere above the summit are derived and the median values for seeing β 0 = 0.93 arcsec and free-atmosphere seeing β free = 0.51 arcsec are determined. Together with the estimations of isoplanatic angle θ 0 = 2.07 arcsec and time constant τ 0 = 2.58 ms, these are the first representative results obtained for Russian sites, and are necessary for the development of modern astronomical observation techniques like adaptive optics.

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Measurements of optical turbulence in the free atmosphere above Mount Maidanak in 2005–2007

Cited by 14 publications

References 17 publications

The statistics of the photometric accuracy based on MASS data and the evaluation of high-altitude wind

The statistics of the photometric accuracy based on MASS data and the evaluation of high-altitude wind

The revision of the turbulence profiles restoration from MASS scintillation indices

First results of a site-testing programme at Mount Shatdzhatmaz during 2007-2009

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