First statistical data on wavefront outer scale at La Silla observatory from the GSM instrument

Details First statistical data on wavefront outer scale at La Silla observatory from the GSM instrument First statistical data on wavefront outer scale at La Silla observatory from the GSM instrument

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...336l..49m&link_type=abstract

Astronomy and Astrophysics, v.336, p.L49-L52 (1998)

Physics

Optics

21

Seeing, Adaptive Optics, Interferometry

Scientific paper

Results of the first monitoring of the wavefront outer scale {cal L_0} during 16 nights at La Silla, Chile, are presented. This parameter is of importance for high angular resolution observing techniques like adaptive optics and optical interferometry. It was measured with the Grating Scale Monitor (GSM) instrument which is based on the analysis of the spatial covariance of angle of arrival fluctuations simultaneously detected at several points on the wavefront. The outer scale distribution is found to be log-normal, with median value of 24 m and rms scatter of lkern -4.1ptlower2pt char19 kern -0.8ptog{cal L_0} of +/- 0.22. Short-duration bursts of {cal L_0} are noted. During 1 hour the {cal L_0} and seeing were simultaneously measured with the ADONIS adaptive optics system at the 3.6 m telescope, and a good agreement with our data was noted. Our measurements of the seeing were found to agree with the ESO DIMM seeing data. Effective wavefront velocity was also found in order to estimate the adaptive optics time constant.

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