&lt;title&gt;Astroclimate of specialized stations of the Large Solar Vacuum Telescope: Part I&lt;/title&gt;

Nosov, V. V.; Grigoriev, V. M.; Kovadlo, P. G.; Лукин, В. П.; Nosov, E. V.; Torgaev, A. V.

doi:10.1117/12.783158

Cited by 4 publications

(9 citation statements)

References 2 publications

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“…In an extended consideration, a coherent structure is a soliton solution of the hydrodynamic equations [6]; it includes both large-scale and small-scale turbulence. As shown in our early optical measurements [7][8][9][10], optical manifestations of actions of extended regions are often observed in the atmosphere, where one coherent structure dominates. So, a question arises about the possible influence of only coherent turbulence on the jitter of optical images.…”

Section: Introductionmentioning

confidence: 93%

“…The Ferrel and Hadley cells are the largest among them (up to 5000 km in radius) [7][8][9][10]. They can be considered as modifications of Benard cells in a thin spherical layer (at the Earth scale).…”

Section: Coherent Structure In Open Airmentioning

confidence: 99%

“…The approximate model of the turbulence spectrum under conditions of manifestation of one coherent turbulent structure was derived earlier in our works [7][8][9][10]. Let us calculate the integral in Eq.…”

Section: Effect Of Coherent Turbulencementioning

confidence: 99%

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Comparison of Kolmogorov’s and coherent turbulence

2014

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Features of optical wave fluctuations while propagating through a randomly inhomogeneous turbulent medium with a finite outer scale are considered, including conditions when areas with dominating influence of one large-scale coherent structure are observed in the atmosphere, for which the spectrum of atmospheric turbulence can differ significantly from the Kolmogorov model spectrum. Using an approximate model of the spectrum for coherent turbulence, described earlier in our works, the variance of jitter of an optical image is calculated (under the applicability condition for the smooth perturbation method). The comparison of these equations with known similar equations for Kolmogorov turbulence has shown that the variance of fluctuations is significantly weaker in coherent turbulence than in the Kolmogorov theory under similar conditions. This means that phase fluctuations of optical radiation decrease significantly in coherent turbulence. The importance of this conclusion is noted for interpretation of the results of optical sounding of atmospheric turbulence.

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Section: Introductionmentioning

confidence: 93%

Section: Coherent Structure In Open Airmentioning

confidence: 99%

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Comparison of Kolmogorov’s and coherent turbulence

2014

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“…The measurement results show that the integrated intensity is almost twice less by the presence in atmosphere the large coherent structures (coherent turbulence) near the telescope than in the case of incoherent Kolmogorov turbulence (the large-scale coherent structures are absent). On the high-mountain optical solar telescope the experiment to the measure of the image jitter of the solar disk edge was made (Sayan Solar Observatory of the Institute of Solar-Terrestrial Physics SB RAS) [1][2][3]. The measurement results show that the effect of the considerable decrease of the image jitters is observed by the presence in the atmosphere near the telescope the large coherent structures (coherent turbulence).…”

Section: Introductionmentioning

confidence: 96%

Comparison of singular-optical and statistical approaches for investigations of turbulence tasks

Лукин

Angelski

Bolbasova

et al. 2013

Eleventh International Conference on Correlation Optics

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Experimental data of our turbulence measurements (by ultrasonic digital sensors) in the various areas and meteosituations show that large areas are often observed in open atmosphere, in which one large coherent structure has the main influence. Turbulence in such areas is called as coherent. Incoherent Kolmogorov turbulence is detecting, as a rule, on sites with a flat surface. Coherent turbulence differs from Kolmogorov turbulence by the faster decrease of a time spectrum in an inertial interval (f -8/ 3 instead of f -5/ 3 ) and the smaller contribution of the high-frequency components.

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“…The first part [21] presents the results of measurements of characteristics of local astroclimate in special production areas of the LSVT. It is demonstrated that the temperature gradients in the telescope rooms are the cause of the initiation of the Benard cell and originating turbulence in the pavilion of the astronomical spectrograph.…”

Section: Introductionmentioning

confidence: 99%

<title>Astroclimate of specialized stations of the Large Solar Vacuum Telescope: Part II</title>

Nosov¹,

Grigoriev²,

Kovadlo³

et al. 2007

SPIE Proceedings

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The paper presents the results of measurements of characteristics of local astroclimate in special production areas of the Large solar vacuum telescope (the Baikal astrophysical observatory of the Institute of Solar-Terrestrial Physics SB RAS). It is demonstrated that the temperature gradients in the telescope rooms are the cause of the initiation of the Benard cell and originating (incipient) turbulence in the pavilion of the astronomical spectrograph. The characteristics of the originating turbulence were studied in detail. It has been found that the measurements date have supported the basic scenarios of stochastization (Landau-Hopf, Ruelle-Takens, Feigenbaum, Pomeau-Menneville scenarios). The Feigenbaum bifurcation diagram has experimentally been supported. It is shown that the basic vortex in Benard cell breaks down into smaller vortices as the result of ten bifurcations of the period duplication. It has been found that the originating turbulence introduced large errors in the data of spectral measurements, even at the path of small length. The horizontal random displacements of spectral lines, appearing due to the pavilion effects, in the horizontal Ebert scheme can reach 1 second of arc. In this case the line displacements occur slowly, at the frequency about 0.01 Hz. Because of low frequencies of line displacements the originating turbulence by its optical characteristics approximated the regular refraction.

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<title>Astroclimate of specialized stations of the Large Solar Vacuum Telescope: Part I</title>

Cited by 4 publications

References 2 publications

Comparison of Kolmogorov’s and coherent turbulence

Comparison of Kolmogorov’s and coherent turbulence

Comparison of singular-optical and statistical approaches for investigations of turbulence tasks

<title>Astroclimate of specialized stations of the Large Solar Vacuum Telescope: Part II</title>

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