The Paranal Surface Layer

Details The Paranal Surface Layer The Paranal Surface Layer

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009otam.conf..136m&link_type=abstract

Optical Turbulence: Astronomy Meets Meteorology, Proceedings of the Astronomy Meets Meteorology, Proceedings of the Optical Turb

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Applications

Seeing, Dimm:Differential Image Motion Monitor, Mass:Multi-Aperture Seeing Scintilometer, Atmosphere: Surface Layer, Atmosphere: Richardson Number

Scientific paper

The wind pattern over Paranal changed suddenly in 1998 when winds from the NNE-NE became much more frequent than before. At the same time the seeing measured by the Paranal DIMM became significantly worse than hitherto. The seeing change, however, was not seen in 1999 when the first VLT Unit Telescope (UT) was commissioned, and while the DIMM seeing continued to deteriorate in subsequent years, the image quality delivered by the UT's remained constant, or even improved with time. In this contribution we describe our attempts to understand the origin of the discrepancy between DIMM and UT's, and the reasons for the dependency of wind direction on DIMM seeing.

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