论文标题
DIMM数据的圆顶连贯时间统计数据
Dome C coherence time statistics from DIMM data
论文作者
论文摘要
我们介绍了南极圆顶C位点的几年DIMM数据的重新分析，以提供对相干时间$τ_0$的测量。 $τ_0$的统计和季节性行为在地面高两个高度，3m和8m的高度下给出，对于波长$λ= 500 $ nm。我们发现每年的中位价值为$ 2.9 $ MS，高达800万美元。也可以在20m的高度上获得一些测量值，并在6月（9月）期间给出6ms的中位数。我们第一次在夏季的白天提供$τ_0$的尺寸，这似乎显示出与当地时间下午5点最高最大值的观察相同的时间。在此特定时刻，满足了10ms以上$τ_0$的特殊值。白天湍流条件的持续缓慢变化为太阳能自适应光学系统提供了天然测试床。
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.
