来自DIMM数据的圆顶C相干时间统计
Dome C coherence time statistics from DIMM data
摘要：
我们提出了一个重新分析几年的DIMM数据在南极洲的圆顶C的网站，提供测量的相干时间$τ_0$。给出了波长为$λ=500$ nm的$τ_0$在离地面3米和8米两个高度上的统计和季节行为。我们发现在8米高度上的年平均值为$2.9$ ms。也可以在20米的高度获得一些测量，并在6月至9月期间给出6ms的中值。我们首次提供夏季白天的$τ_0$测量结果，它显示出与当地时间下午5点最大值的视宁度相同的时间依赖性。在该特定时刻，满足$τ_0$高于10 ms的异常值。白天湍流条件的连续缓慢变化为太阳能自适应光学系统提供了一个天然的测试平台。
英文摘要：
We present a reanalysis of several years of DIMM data at the site of Dome C, Antarctica, to provide measurements of the coherence time $τ_0$. Statistics and seasonal behaviour of $τ_0$ are given at two heights above the ground, 3m and 8m, for the wavelength $λ=500$nm. We found an annual median value of $2.9$ms at the height of 8m. A few measurements could also be obtained at the height of 20m and give a median value of 6ms during the period June--September. For the first time, we provide measurements of $τ_0$ in daytime during the summer, which appears to show the same time dependence as the seeing with a sharp maximum at 5pm local time. Exceptional values of $τ_0$ above 10ms are met at this particular moment. The continuous slow variations of turbulence conditions during the day offers a natural test bed for a solar adaptive optics system.
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