Journal
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES
Volume 144, Issue 1, Pages 39-44Publisher
EDP SCIENCES S A
DOI: 10.1051/aas:2000197
Keywords
turbulence; atmospheric effects; site testing
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Main atmospheric parameters characterizing the turbulence were measured at the Paranal ESO Observatory (Chile) with the Generalized Seeing Monitor (GSM) during 19 nights in November-December 1998. The median seeing for this period was 0.88 , a little worse than average, the spatial coherence outer scale of the wavefront L-0 = 22.0 m and the median isoplanatic angle theta(0) = 1.90 . A very good agreement with seeing values given by ESO DIMM was found. Effects of ground layer turbulence were estimated from measurements of temperature micro-fluctuations at several altitudes. These measurements revealed that the first 21 m above ground account for 12.5% of the total turbulent energy. Comparison between GSM and ESO DIMM values have permitted to highlight a local phenomenon which occurs sometimes at the site in the middle of the night. Statistics of the refractive index structure constant C-n(2) in the surface laver is also studied.
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