Statistics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007rmxac..31...93s&link_type=abstract
Workshop on Astronomical Site Evaluation (Eds. Irene Cruz-González, Juan Echevarría, & David Hiriart) Revista Mexicana de Astron
Statistics
Atmospheric Effects, Methods: Data Analysis, Site Testing, Turbulence
Scientific paper
Results from experiments measuring the contribution of the surface layer (2.3 to 15 m) to the optical seeing at the Observatorio Astronómico Nacional at San Pedro Mártir (OAN-SPM) are reported. Microthermal sensors placed at 7 heights on a 15-m-high instrumented mast were used to measure the structure constant of the refractive index C_{mathrm{n}}(2) . The integrated seeing parameter was measured with a Differential Image Motion Monitor (DIMM) during 23 nights. Log-normal statistics were found for the DIMM seeing with a median value of 0rlap .(arcsec) 84. The surface layer average seeing was found to be 0rlap .(arcsec) 16. The measured optical turbulence of this layer has a mean contribution of 5.2% to the total C_{mathrm{n}}(2) , which corresponds to a mean degradation of 3.2% of the total seeing. These values are similar to those found in other observatories around the world, suggesting that the presence of trees in the OAN-SPM does not have a significant effect on the surface layer seeing.
Agabi Abdelkrim
Avila Ricardo
Azouit Max
Cruz D. X.
Cruz-Gonzalez Irene
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