11 July 2008 Two campaigns to compare three turbulence profiling techniques at Las Campanas Observatory
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Abstract
In preparation to characterize the Giant Magellan Telescope site and guide the development of its adaptive optics system, two campaigns to systematically compare the turbulence profiles obtained independently with three different instruments were conducted at Las Campanas Observatory in September, 2007 and January 2008. Slope detection and ranging (SLODAR) was used on the 2.5-m duPont telescope. SLODAR measures the C2n profile as a function of altitude through observations of double stars. The separation of the observed double star sets the maximum altitude and height resolution. Ground layer (altitudes < 1 km) and free atmosphere turbulence profiles are compared with those obtained with a lunar scintillometer (LuSci) and a multi-aperture scintillation sensor (MASS), respectively. In addition, the total atmospheric seeing was measured by both SLODAR and a differential image motion monitor (DIMM).
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Joanna Thomas-Osip, Joanna Thomas-Osip, Edison Bustos, Edison Bustos, Michael Goodwin, Michael Goodwin, Charles Jenkins, Charles Jenkins, Andrew Lambert, Andrew Lambert, Gabriel Prieto, Gabriel Prieto, Andrei Tokovinin, Andrei Tokovinin, } "Two campaigns to compare three turbulence profiling techniques at Las Campanas Observatory", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70145I (11 July 2008); doi: 10.1117/12.789957; https://doi.org/10.1117/12.789957
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