Two campaigns to compare three turbulence profiling techniques at Las Campanas Observatory

Joanna Thomas-Osip; Edison Bustos; Michael Goodwin; Charles Jenkins; Andrew Lambert; Gabriel Prieto; Andrei Tokovinin

doi:10.1117/12.789957

11 July 2008 Two campaigns to compare three turbulence profiling techniques at Las Campanas Observatory

Joanna Thomas-Osip, Edison Bustos, Michael Goodwin, Charles Jenkins, Andrew Lambert, Gabriel Prieto, Andrei Tokovinin

Proceedings Volume 7014, Ground-based and Airborne Instrumentation for Astronomy II; 70145I (2008) https://doi.org/10.1117/12.789957
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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 C²_n 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).

Citation Download Citation

Joanna Thomas-Osip, Edison Bustos, Michael Goodwin, Charles Jenkins, Andrew Lambert, Gabriel Prieto, and 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); https://doi.org/10.1117/12.789957

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