Optical Turbulence Characterization at LAMOST Site: Observations and Models
Optical Turbulence Characterization at LAMOST Site: Observations and Models
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DOI：
10.1093/mnras/stv1165
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发表时间：
2015-05
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影响因子：
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通讯作者：
L. Liu;C.Giordano;Y. Yao;J.Vernin;M. Chadid;H.-S. Wang;J. Yin;Y.-P. Wang
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文献类型：
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作者：
L. Liu;C.Giordano;Y. Yao;J.Vernin;M. Chadid;H.-S. Wang;J. Yin;Y.-P. Wang
大气光学湍流严重限制了高角分辨率仪器的性能。2011年在LAMOST现场进行了为期8晚的测量活动，以确定光学湍流的特征。在这次行动中建立了两台仪器：一台用于测量大气总视宁度的差动图像运动监视器(DIMM)，以及一台用于测量湍流Cn^2(H)和水平风速V(H)的垂直廓线的单星西西达(SSS)。光学湍流参数的计算采用天气研究和预报(WRF)模式和Trquiet-Vernin模式相结合的方法，该模式利用当地气象参数描述大气湍流的光学效应。本文介绍了高角分辨率天文学中涉及的光学参数的评估。它包括视宁度、等晕角、相干时间、相干张量、光学湍流强度的垂直廓线和水平风速V(H)。用DIMM、SSS和WRF模式预测的视宁度中位数分别为1.01、1.17和1.07角秒。回顾了LAMOST站点的视宁度测量历史，并与世界上其他天文台的湍流测量结果进行了比较。
Atmospheric optical turbulence seriously limits the performance of high angular resolution instruments. An 8-night campaign of measurements was carried out at the LAMOST site in 2011, to characterize the optical turbulence. Two instruments were set up during the campaign: a Differential Image Motion Monitor (DIMM) used to measure the total atmospheric seeing, and a Single Star Scidar (SSS) to measure the vertical profiles of the turbulence C_n^2(h) and the horizontal wind velocity V(h). The optical turbulence parameters are also calculated with the Weather Research and Forecasting (WRF) model coupled with the Trinquet-Vernin model, which describes optical effects of atmospheric turbulence by using the local meteorological parameters. This paper presents assessment of the optical parameters involved in high angular resolution astronomy. Its includes seeing, isoplanatic angle, coherence time, coherence etendue, vertical profiles of optical turbulence intensity _n^2(h)$ and horizontal wind speed V(h). The median seeing is respectively 1.01 arcsec, 1.17 arcsec and 1.07arcsec as measured with the DIMM, the SSS and predicted with WRF model. The history of seeing measurements at the LAMOST site are reviewed, and the turbulence measurements in this campaign are compared with other astronomical observatories in the world.