Excellent daytime seeing at Dome Fuji on the Antarctic plateau
Excellent daytime seeing at Dome Fuji on the Antarctic plateau
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DOI：
10.1051/0004-6361/201321937
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发表时间：
2013-05
影响因子：
6.5
通讯作者：
H. Okita;T. Ichikawa;M. Ashley;N. Takato
中科院分区：
文献类型：
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作者：
H. Okita;T. Ichikawa;M. Ashley;N. Takato
语境。富士穹顶是南极高原第二高的地区，预计将拥有地球上最好的天文观测地点。然而，富士圆顶的现场测试仍处于早期阶段。目标。研究富士圆顶上方自由大气中的天文视宁度，并确定表面边界层的高度。方法。 2012/2013 年南方夏季，使用差分图像运动监视器在富士圆顶雪面上方 11 m 的高度处测量可见光 (472 nm) 的视宁度。结果。已观察到视宁度低于 0.2 英寸。当地时间 18 点左右，当地的视宁度通常达到约 0.3 英寸的最小值。还观察到了一些 0.3 英寸或更小的视宁度良好的时期，有时在当地午夜会持续几个小时。中位视宁度较高，为 0.52 英寸——这个大值被认为是由望远镜处于湍流边界层内的时期造成的。结论。 Dome Fuji 白天视宁度的日变化与 Dome C 报道的类似，并且表面边界层的高度与之前对 Dome Fuji 的模拟一致。自由大气视宁度约为0.2''，表面边界层的高度可低至约11 m。
Context. Dome Fuji, the second highest region on the Antarctic plateau, is expected to have some of the best astronomical seeing on Earth. However, site testing at Dome Fuji is still in its very early stages. Aims. To investigate the astronomical seeing in the free atmosphere above Dome Fuji, and to determine the height of the surface boundary layer. Methods. A Differential Image Motion Monitor was used to measure the seeing in the visible (472 nm) at a height of 11 m above the snow surface at Dome Fuji during the austral summer of 2012/2013. Results. Seeing below 0.2'' has been observed. The seeing often has a local minimum of ~0.3'' near 18 h local time. Some periods of excellent seeing, 0.3'' or smaller, were also observed, sometimes extending for several hours at local midnight. The median seeing is higher, at 0.52''---this large value is believed to be caused by periods when the telescope was within the turbulent boundary layer. Conclusions. The diurnal variation of the daytime seeing at Dome Fuji is similar to that reported for Dome C, and the height of the surface boundary layer is consistent with previous simulations for Dome Fuji. The free atmosphere seeing is ~0.2'', and the height of the surface boundary layer can be as low as ~11 m.