Atmospheric scintillation at Dome C, Antarctica: implications for photometry and astrometry

Details Atmospheric scintillation at Dome C, Antarctica: implications for photometry and astrometry Atmospheric scintillation at Dome C, Antarctica: implications for photometry and astrometry

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iauss...7e..30k&link_type=abstract

Astronomy in Antarctica, 26th meeting of the IAU, Special Session 7, 22-23 August, 2006 in Prague, Czech Republic, SPS7, #30

Astronomy and Astrophysics

Astronomy

Scientific paper

Night-time turbulence profiles of the atmosphere above Dome C, Antarctica, were measured during 2004, using a MASS instrument. We compare this data with turbulence profiles above Cerro Tololo and Cerro Pachon, also measured with a MASS, and find, with the exception of the owest layer, that Dome C has significantly less turbulence. In addition, the integrated at turbulence 16 km above Dome C is always less than the median values at the two Chilean sites. Using average wind speed profiles, we assess the photometric noise produced by scintillation, and the atmospheric contribution to the error budget in narrow angle differential astrometry. In comparison with the two mid-latitude sites in Chile, Dome C offers a potential gain of about 3.6 in both photometric precision (for long integrations) and narrow-angle astrometry precision. Although the data from Dome C cover a fairly limited time frame, they lend strong support to expectations that Dome C will offer significant advantages for photometric and astrometric studies.

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