Overcoming the Boundary Layer Turbulence at Dome C: Ground-Layer Adaptive Optics versus Tower
نویسندگان
چکیده
منابع مشابه
Overcoming the Boundary Layer Turbulence at Dome C: Ground-Layer Adaptive Optics versus Tower
The unique atmospheric conditions present at sites such as Dome C on the Antarctic plateau are very favorable for high spatial resolution astronomy. At Dome C, the majority of the optical turbulence is confined to a 30 to 40 m thick stable boundary layer that results from the strong temperature inversion created by the heat exchange between the air and the ice-covered ground. To fully realize t...
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Ground-layer adaptive optics (GLAO) promises a significant improvement in image width and energy concentration over atmospheric seeing in a relatively wide field by compensating for low-altitude turbulence only. This approach, which is intermediate between full AO and seeing-limited observations, can benefit many astronomical programs in the visible and near-infrared. We have developed a simple...
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Ground layer Adaptive Optics (GLAO) is a new variant of adaptive optics that aims at correcting the seeing over a wide field of view by conjugating the deformable mirror to the boundary layer altitude.The South Pole is expected to be particularly to GLAO due to the absence of high altitude jets and the confinement of 96% of the seeing within a 220 m boundary layer. We present here the compariso...
متن کاملPlanetary Boundary Layer Turbulence
In previous chapters boundary layers were evident as thin layers across which thermal, dynamic, and material properties of a free interior flow make a transition to their boundary values and/or boundary fluxes. In those cases the thinness of the boundary layer was typically a statement of the smallness of the relevant diffusivity; e.g., the depth h of the laminar Ekman boundary layer scales as ...
متن کاملSampling the Ground Layer of the Atmosphere at Dome C using fast Sonic-anemometers
The ground layer turbulence at Dome C is the cause for more than 90% of the total turbulence column. While the height of this layer has been currently measured to be approximately 30m, no long term statistics is available from this part of the atmosphere. In order to plan the construction of future telescope at this site temperature site, temperature, wind speed and turbulence measurements are ...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 2009
ISSN: 0004-6280,1538-3873
DOI: 10.1086/600077