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Proceedings Paper

Results from the GMT ground-layer experiment at the Magellan Telescopes
Author(s): A. Athey; S. Shectman; M. Phillips; J. Thomas-Osip
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Paper Abstract

We present results from our two year study of ground-layer turbulence as seen through the 6.5-meter Magellan Telescopes at Las Campanas Observatory. The experiment consists of multiple, moderate resolution, Shack- Hartmann wavefront sensors deployed over a large 16 arcminute field. Over the two years of the experiment, the ground-layer turbulence has been sampled on eleven nights in a variety of seeing and wind conditions. On most nights the ground-layer turbulence contributes 10% to the total visible-band seeing, although a few nights exhibit ground-layer contributions up to 30%. We present the ground-layer turbulence on the sampled nights as well as a demonstration of its strength as a function of field size. This information is combined with data from a MASS-DIMM seeing monitor adjacent to the Magellan Telescopes to infer the annual ground-layer contribution to seeing at Las Campanas.

Paper Details

Date Published: 27 June 2006
PDF: 14 pages
Proc. SPIE 6272, Advances in Adaptive Optics II, 627217 (27 June 2006); doi: 10.1117/12.672276
Show Author Affiliations
A. Athey, Carnegie Observatories (United States)
S. Shectman, Carnegie Observatories (United States)
M. Phillips, Las Campanas Observatory, Carnegie Observatories (Chile)
J. Thomas-Osip, Las Campanas Observatory, Carnegie Observatories (Chile)

Published in SPIE Proceedings Vol. 6272:
Advances in Adaptive Optics II
Brent L. Ellerbroek; Domenico Bonaccini Calia, Editor(s)

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