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arXiv 0904.1865astro-ph.IM
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30米望远镜现场测试VI:Turbulence剖面图

Thirty Meter Telescope Site Testing VI: Turbulence Profiles

S. G. Els, T. Travouillon, M. Schoeck, R. Riddle, W. Skidmore, J. Seguel, E. Bustos, D. Walker

摘要:

本文报道了30米望远镜(TMT)在五山上空光学湍流垂直分布的现场测试结果。在墨西哥的San Pedro Martir,Mauna Kea的13 North站点和智利北部的Cerro Tolar,Cerro Armazones和Cerro Tolonchar的三座山,MASS-DIMM湍流廓线仪已经运行了至少两年。在这些地点还使用了声波湍流廓线仪-SODAR。所获得的湍流剖面表明,在所有站点的最低200米是观测到的总视宁度的主要来源,智利站点的地面层比其他两个站点弱。北半球的两个观测点在500 m以上的高度有较弱的湍流,其中13 N在16 km处的湍流最弱,这是造成该观测点等晕角较大的原因。本文讨论了近地面急流和风速对晴空湍流强度的影响,以及季节和夜间的变化。这是讨论TMT站点测试项目的系列文章中的第六篇。

英文摘要:

The results on the vertical distribution of optical turbulence above the five mountains which were investigated by the site testing for the Thirty Meter Telescope (TMT) are reported. On San Pedro Martir in Mexico, the 13 North site on Mauna Kea and three mountains in northern Chile Cerro Tolar, Cerro Armazones and Cerro Tolonchar, MASS-DIMM turbulence profilers have been operated over at least two years. Acoustic turbulence profilers - SODARs - were also operated at these sites. The obtained turbulence profiles indicate that at all sites the lowest 200m are the main source of the total seeing observed, with the Chilean sites showing a weaker ground layer than the other two sites. The two northern hemisphere sites have weaker turbulence at altitudes above 500m, with 13N showing the weakest 16km turbulence, being responsible for the large isoplanatic angle at this site. The influence of the jetstream and wind speeds close to the ground on the clear sky turbulence strength throughout the atmosphere are discussed, as well as seasonal and nocturnal variations. This is the sixth article in a series discussing the TMT site testing project.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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