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Proceedings Paper

Overview of site monitoring at the SAAO
Author(s): T. Pickering; S. M. Crawford; L. Catala; D. Buckley; A. Ziad; R. Wilson
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Paper Abstract

We present a comprehensive review of the first two years of a site monitoring campaign at the South African Astronomical Observatory (SAAO) located outside Sutherland, South Africa. This campaign is in support of the Southern African Large Telescope (SALT), a 11-metre, fixed-elevation, optical telescope located at SAAO . The heart of this observing campaign involves continuous monitoring of the site by a MASS-DIMM instrument. The MASS-DIMM has been in routine use since March 2010 and its operation is now fully automated. At the beginning of this campaign, simultaneous observations were also made by a SLODAR instrument, which allows high resolution observations of the lower atmosphere. In August 2011 a two week campaign was carried out with a two-channel Generalized Seeing Monitor (GSM) telescope along with a lunar limb profiler (Profileur Bord Lunaire; PBL). Combined with the MASS-DIMM data these observations provide multiple independent measurements of atmospheric turbulence as a function of height. They also help improve the calibration of our site for more direct comparison to other major astronomical observatories. Our results so far indicate that the atmospheric conditions at the SAAO Sutherland site have deteriorated compared to past measurements. The ground layer accounts for the majority of the integrated seeing, while the free atmosphere seeing is comparable with other major sites.

Paper Details

Date Published: 27 September 2012
PDF: 7 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84446A (27 September 2012); doi: 10.1117/12.927079
Show Author Affiliations
T. Pickering, South African Astronomical Observatory (South Africa)
Southern African Large Telescope (South Africa)
S. M. Crawford, South African Astronomical Observatory (South Africa)
L. Catala, South African Astronomical Observatory (South Africa)
Univ. of Cape Town (South Africa)
D. Buckley, Southern African Large Telescope (South Africa)
A. Ziad, Lab. J.L. Lagrange, CNRS (France)
R. Wilson, Univ. of Durham (United Kingdom)


Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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