Testing seeing quality

Details Testing seeing quality Testing seeing quality

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983esoc...17..255r&link_type=abstract

IN: Workshop on ESO's Very Large Telescope, Cargese, Corse, France, May 16-19, 1983, Proceedings (A84-48051 23-89). Garching, We

Physics

Optics

Atmospheric Optics, Atmospheric Turbulence, Meteorological Parameters, Site Selection, Telescopes, Atmospheric Correction, Refractivity, Richardson Number

Scientific paper

Problems of good telescope site location to solve image degradation are discussed. Differences between dome seeing, which is related to turbulence within the instrument, and atmospheric seeing which is related to image degradation due to the fluctuations of the atmospheric reflective index are analyzed, stressing the need for an appropriate choice of telescope location. Methods for site testing are presented considering three types of parameters: meteorological (pressure, temperature, and wind profiles), turbulence, and optical (speckle life time and Fried parameter). Good turbulence profiles yield reliable estimates of the image quality and techniques measuring these profiles are covered in detail. Although in situ measurements can be done they are cumbersome, while remote sensing through use of optical sensors seems the most promising. These techniques not only provide accurate estimates of optical quality of the atmosphere but also reveal the atmospheric layers which contribute to image degradation. Relating these turbulent layers to meteorological data yields better estimates of their occurrence frequency and gives hints on how to possibly avoid them by an appropriate site selection.

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