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This paper analyses 3.5 years of site testing data obtained at Dome C,Antarctica, based on measurements obtained with three DIMMs located at threedifferent elevations. Basic statistics of the seeing and the isoplanatic angleare given, as well as the characteristic time of temporal fluctuations of thesetwo parameters, which we found to around 30 minutes at 8 m. The 3 DIMMs areexploited as a profiler of the surface layer, and provide a robust estimationof its statistical properties. It appears to have a very sharp upper limit(less than 1 m). The fraction of time spent by each telescope above the top ofthe surface layer permits us to deduce a median height of between 23 m and 27m. The comparison of the different data sets led us to infer the statisticalproperties of the free atmosphere seeing, with a median value of 0.36 arcsec.The C_n^2 profile inside the surface layer is also deduced from the seeing dataobtained during the fraction of time spent by the 3 telescopes inside thisturbulence. Statistically, the surface layer, except during the 3-month summerseason, contributes to 95 percent of the total turbulence from the surfacelevel, thus confirming the exceptional quality of the site above it.

Dome C site testing: surface layer, free atmosphere seeing and isoplanatic angle statistics