Night-time measurements of astronomical seeing at Dome A in Antarctica
Ma, Bin1,2; Shang, Zhaohui1,3; Hu, Yi1; Hu, Keliang1; Wang, Yongjiang1; Yang, Xu1; Ashley, Michael C. B.4; Hickson, Paul2; Jiang, Peng5
Source PublicationNATURE
AbstractSeeing-the angular size of stellar images blurred by atmospheric turbulence-is a critical parameter used to assess the quality of astronomical sites at optical/infrared wavelengths. Median values at the best mid-latitude sites are generally in the range of 0.6-0.8 arcseconds(1-3). Sites on the Antarctic plateau are characterized by comparatively weak turbulence in the free atmosphere above a strong but thin boundary layer(4-6). The median seeing at Dome C is estimated to be 0.23-0.36 arcseconds(7-10)above a boundary layer that has a typical height of 30 metres(10-12). At Domes A and F, the only previous seeing measurements have been made during daytime(13,14). Here we report measurements of night-time seeing at Dome A, using a differential image motion monitor(15). Located at a height of just 8 metres, it recorded seeing as low as 0.13 arcseconds, and provided seeing statistics that are comparable to those at a height of 20 metres at Dome C. This indicates that the boundary layer was below 8 metres for 31 per cent of the time, with median seeing of 0.31 arcseconds, consistent with free-atmosphere seeing. The seeing and boundary-layer thickness are found to be strongly correlated with the near-surface temperature gradient. The correlation confirms a median thickness of approximately 14 metres for the boundary layer at Dome A, as found from a sonic radar(16). The thinner boundary layer makes it less challenging to locate a telescope above it, thereby giving greater access to the free atmosphere. The night-time seeing (the extent to which a star's light is blurred by the atmosphere) at Dome A, the highest part on the Antarctic plateau, can be as good as 0.13 arcseconds above a height of only 8 metres.
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000554831500029
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Document Type期刊论文
Corresponding AuthorMa, Bin; Shang, Zhaohui; Hu, Yi
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
2.Univ British Columbia, Dept Phys & Astron, Vancouver, BC, Canada
3.Tianjin Normal Univ, Tianjin Astrophys Ctr, Tianjin, Peoples R China
4.Univ New South Wales, Sch Phys, Sydney, NSW, Australia
5.Polar Res Inst China, Key Lab Polar Sci, MNR, Shanghai, Peoples R China
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GB/T 7714
Ma, Bin,Shang, Zhaohui,Hu, Yi,et al. Night-time measurements of astronomical seeing at Dome A in Antarctica[J]. NATURE,2020,583(7818):771-+.
APA Ma, Bin.,Shang, Zhaohui.,Hu, Yi.,Hu, Keliang.,Wang, Yongjiang.,...&Jiang, Peng.(2020).Night-time measurements of astronomical seeing at Dome A in Antarctica.NATURE,583(7818),771-+.
MLA Ma, Bin,et al."Night-time measurements of astronomical seeing at Dome A in Antarctica".NATURE 583.7818(2020):771-+.
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