Mathematics – Logic
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011rmxac..41...16c&link_type=abstract
Astronomical Site Testing Data in Chile (Eds. M. Curé, A. Otárola, J. Marín, & M. Sarazin) Revista Mexicana de Astronomía y Astr
Mathematics
Logic
Atmospheric Effects, Site Testing, Turbulence
Scientific paper
MM5 meteorological model was tested that is a good tool to estimate and forecast the meteorological variables in astronomical sites in the north of Chile. Configuring the MM5 in high horizontal, vertical and temporarily resolution we tested two models to estimate the vertical profile of the optical turbulence (C_n^2) and seeing in Paranal and Armazones sites. AFGL model (M1) and Masciadri's model (M2) are methods to estimate the vertical structure of the C_n^2 using meteorological parameters like wind magnitude, temperature, pressure, humidity, potential temperature and TKE in his equations. We tested different parameterizations for the atmospherical physics processes in the MM5 model, where Gayno-Seaman parameterization of the boundary layer and the M2 method have the best results. These results were compared with a measurement campaign developed in Paranal between November and December of 2007 where using simultaneously two instruments, SCIDAR and DIMM, to measurement the C_n^2 and seeing. The results shows that the C_n^2 simulated profile have very good correspondence in almost all profile compared with SCIDAR measurements, but near of the ground the difference is big, because the instruments take in account also the turbulence provoked by telescopes buildings and near of the ground the MM5 model have systematic errors. In Paranal the RMSE average seeing over 12 days is 0.45 arcsec and in Armazones the RMSE average seeing is 0.19 arcsec.
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