Astronomical seeing at Maidanak Observatory with differential image motion monitor

Azimov, Azimjon; Tillayev, Yusufjon; Ehgamberdiev, Shuhrat A.; Ilyasov, Sabit

doi:10.1117/1.jatis.8.4.047002

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…The second period of seeing observations began in August 2018 [17,18]. Measurements were made using a modified version of DIMM on the same 6 m-high platform.…”

Section: Introductionmentioning

confidence: 99%

Surface Layer Turbulence at the Maidanak Observatory

Azimov,

Tillayev,

Ehgamberdiev

et al. 2023

Atmosphere

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Results of night-time surface layer turbulence measurements using ESO LuSci at the Maidanak observatory are presented. Turbulence in the surface layer was evaluated at the Maidanak observatory using LuSci during the period of 2021–2022. The overall median DIMM-seeing was 0.74 arcseconds during this period. It was determined that the seeing in the surface layer up to 256 m equals 0.44 arcseconds. This corresponds to 42% of the contribution to the integral seeing in the entire atmosphere. A telescope installed at 6 m above the ground will be affected by 33% of the integral turbulence and about 79% of the surface layer one. Taking into account that the free atmosphere contributes around 30%, we conclude that around 30% of the overall seeing is contributed by the boundary layer above the Maidanak observatory.

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“…The second period of seeing observations began in August 2018 [17,18]. Measurements were made using a modified version of DIMM on the same 6 m-high platform.…”

Section: Introductionmentioning

confidence: 99%

Surface Layer Turbulence at the Maidanak Observatory

Azimov,

Tillayev,

Ehgamberdiev

et al. 2023

Atmosphere

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Atmospheric parameters affecting astronomical observations at the Maidanak Observatory

Tillayev

2024

Observatory Operations: Strategies, Processes, and Systems X

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The aim of this research is to present the optical turbulence and meteorological parameters at the surface layer, wind speed in the level of tropopause as well as precipitable water vapor above the Maidanak observatory in Uzbekistan. The paper presents an analysis of the atmospheric conditions focusing on factors affecting optical astronomical observations. The surface layer turbulence and its impact on astronomical seeing were evaluated. The seeing in the surface layer has a moderate correlation with wind speed and weaker one with temperature gradients. The wind speed at the 200mB level demonstrates weak seasonal variations with the median value of 28.4 m/s, however does not almost change in long-term period. Maidanak observatory has relatively low amount of PWV with yearly average of 6.2 mm. There are significant seasonal variations in precipitable water vapor, with the highest levels occurring during the summer months.

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Astronomical Seeing and Meteorological Parameters at Maidanak Observatory

et al. 2023

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In this article, we present the results of astronomical seeing measurements conducted at the Maidanak observatory and the influence of meteorological parameters on astronomical seeing. A differential image motion monitor (DIMM) was used to measure astronomical seeing. Astronomical seeing observations were made between 2018–2022, mainly in the summer and autumn months. A total of 266 night observations were conducted between 2018 and 2022. For the whole time frame, the median seeing value was 0.69 arc seconds. With a median value of 0.65″, 2019 is the year with the best seeing, and 2021 has the worst seeing (0.71″). Analysis of long-term variations of the amount of clear time revealed a small trend of decrease in the amount. The correlation between the meteorological parameters and seeing was analyzed. It was determined that the meteorological parameters with the greatest impact on the seeing are wind speed and nighttime temperature variation. The correlation coefficient was equal to 13% and 21% for both quantities. It was found that wind direction and temperature have a relatively weak correlation with astronomical seeing.

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Astronomical seeing at Maidanak Observatory with differential image motion monitor

Cited by 4 publications

References 15 publications

Surface Layer Turbulence at the Maidanak Observatory

Surface Layer Turbulence at the Maidanak Observatory

Atmospheric parameters affecting astronomical observations at the Maidanak Observatory

Astronomical Seeing and Meteorological Parameters at Maidanak Observatory

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