Measurements of tilt angular anisoplanatism

Belen'kii, Mikhail S.; Karis, Stephen J.; Brown, James M.; Fugate, Robert Q.

doi:10.1117/12.290165

Cited by 4 publications

(2 citation statements)

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“…Large p values were detected, for example, by Belen'kii et al (1997) who observed Polaris image motion with a telescope bolted in place so as to minimize uncontrolled telescope movements. For the tilt power spectra they found approximately a −1 slope in the low frequency range, which corresponds to p = 1.…”

Section: Discussionmentioning

confidence: 99%

Non-Kolmogorov features of differential image motion restored from the Multichannel Astrometric Photometer data

Lazorenko

2002

A&A

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Abstract. In this paper we present a new restoration of atmospheric turbulent parameters using published data on image motion observations with the Multichannel Astrometric Photometer. These data have been previously analyzed by Han (1989) whose estimate of the power of the phase structure function α = 1.64 was close to the 5/3 value expected for the Kolmogorov atmospheric turbulence. Investigating the temporal image motion spectrum, we show, however, that the experimental data do not follow predictions of the Kolmogorov model. The best fitting of the observed spectrum is achieved with α = 1.9−2.0, which is typical of non-classic phase distortions. The outer scale of turbulence was found to be 1800 m or longer. Expressions for the non-Kolmogorov temporal spectrum of differential image motion allowing for a finite outer scale length are given.

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Section: Discussionmentioning

confidence: 99%

Non-Kolmogorov features of differential image motion restored from the Multichannel Astrometric Photometer data

Lazorenko

2002

A&A

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“…A linear rise in standard deviation of differential tilt was observed for star separation varying from 10 ′′ −58 ′′ . In another experiment, images of the Moon's edge were used to obtain a statistical estimate of tilt angular correlation and tilt averaging functions over a continuous wide range of angular separations (Belen'kii et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Measurements of atmospheric turbulence parameters at Vainu Bappu Observatory using short-exposure CCD images

Sreekanth

Banyal

Sridharan

et al. 2019

Res. Astron. Astrophys.

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We report atmospheric turbulence parameters, namely atmospheric seeing, tilt-anisoplanatic angle (θ 0) and coherence time (τ 0), measured under various sky conditions, at Vainu Bappu Observatory in Kavalur. Bursts of short exposure images of selected stars were recorded with a high-speed, frame-transfer CCD mounted on the Cassegrain focus of a newly commissioned 1.3 m telescope. The estimated median seeing is ≈ 1.85″ at wavelength of ∼ 600 nm, the image motion correlation between different pairs of stars is ∼ 44% for θ 0 ≈ 36″ and mean τ 0 is ≈ 2.4 ms. This work was motivated by the design considerations and expected performance of an adaptive optics system that is currently being planned for the telescope.

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