The ESO atmospheric temporal coherence monitor dedicated to high angular resolution imaging

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Technics: Interferometric, Site Testing, Atmospheric Effects

Scientific paper

Seeing monitors using the differential image motion method were developed in the eighties for several site studies worldwide. Such an instrument has been included in the Astronomical Weather Station of La Silla, now part of standard astronomical observing in the observatory. In preparation for the interferometric mode of the VLT at Cerro Paranal, a new type of measurement has been undertaken to understand the physics of atmospheric motion and its relation to the temporal coherence of the wavefront at the telescope level. The concept of the coherence monitor is described and the first results of continuous monitoring with a prototype instrument are presented.

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