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Winter site testing at Dome C, Antarctica: first results
Proceedings of the European Interferometry Initiative Workshop organized in the context of the 20005 Joint European and National Astronomy Meeting "Distant Worlds"
We present site testing results obtained in night-time during the polar winter at Dome C. These results were collected during the first Concordia winterover by A. Agabi. They are based upon seeing and isoplanatic angle monitoring, as well as in-situ balloon measurements of the refractive index structure constant profiles C2n(h). The atmosphere is divided into two regions: (i) a 36 m high surface layer responsible for 87% of the turbulence and (ii) a very stable free atmosphere above with a median seeing of 0.36 +- 0.19 arcsec at an elevation of h = 30 m. The median seeing measured with a DIMM placed on top of a 8.5 m high tower is 1.3 +- 0.8 arcsec.