科代卡纳尔天文台的昼间湍流强度剖面测量

IF 1.7 3区 工程技术 Q2 ENGINEERING, AEROSPACE
Saraswathi Kalyani Subramanian, Sridharan Rengaswamy, Prasanna Gajanan Deshmukh, Binukumar G. Nair, S. Mahesh Babu
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引用次数: 0

摘要

印度天体物理研究所正在为科戴卡纳尔塔式望远镜开发一个多共轭自适应光学系统。在此背景下,我们在科代卡纳尔天文台测量了白天的湍流强度曲线。第一种方法基于波前传感器图像,称为太阳差分图像运动监测器+,用于估算高度达 5 至 6 千米的高空湍流。第二种方法使用气球上的温度传感器测量高达 350 米的近地湍流。我们还进行了模拟,以验证我们系统的性能。我们报告了首次在观测站进行的白天湍流强度剖面测量。我们发现在观测站上方 3 公里处存在一个强湍流层。测量到的近地湍流与模型中预期的白天湍流成分的趋势相吻合,在 500 纳米处的综合 r0 为 4 厘米。这与先前的观测测量结果一致。这表明,用小型望远镜和简单的温度传感器阵列组成的低成本装置,可以用来估计现场的湍流强度剖面。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Daytime turbulence strength profile measurement at Kodaikanal Observatory
The Indian Institute of Astrophysics is developing a Multi-Conjugate Adaptive Optics system for the Kodaikanal Tower Telescope. In this context, we measured the daytime turbulence strength profile at the Kodaikanal Observatory. The first method based on wavefront sensor images, called solar differential image motion monitor+, was used to estimate the higher altitude turbulence up to a height of 5 to 6 km. The second method used balloon-borne temperature sensors to measure the near-Earth turbulence up to 350 m. We also carried out simulations to validate the performance of our system. We report the first-ever daytime turbulence strength profile measurements at the observatory. We identified the presence of a strong turbulence layer ∼3 km above the observatory. The measured near-Earth turbulence matches the trend that is expected from the model for a daytime component of turbulence and gives an integrated r0 of ∼4 cm at 500 nm. This is consistent with earlier seeing measurements. This shows that a low-cost setup with a small telescope and a simple array of temperature sensors can be used for estimating the turbulence strength profile at the site.
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来源期刊
CiteScore
4.40
自引率
13.00%
发文量
119
期刊介绍: The Journal of Astronomical Telescopes, Instruments, and Systems publishes peer-reviewed papers reporting on original research in the development, testing, and application of telescopes, instrumentation, techniques, and systems for ground- and space-based astronomy.
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