Contribution of the surface layer to the seeing at san pedro mÁrtir: Simultaneous microthermal and dimm measurements
Por:
SÁnchez L.J., Cruz D.X., Avila R., Agabi A., Azouit M., Cuevas S., Garfias F., GonzÁlez S.I., Harris O., Masciadri E., Orlov V.G., Vernin J., VOYTSEKHOVICH, VALERY
Publicada:
1 ene 2003
Resumen:
Results from experiments measuring the contribution of the surface layer to the optical seeing at the Observatorio Astronómico Nacional at San Pedro MÁrtir (OAN-SPM) are reported. Microthermal sensors placed at 7 levels on a 15-m-high instrumented mast were used to measure the structure constant of the refractive index C2 n. The integrated seeing parameter was measured with a differential Image Motion Monitor during 23 nights. Log-normal statistics were found for the seeing with mean of 0.98'' and median value 0.84''. The contribution of the surface layer (2.3 to 15 m) to the total optical turbulence has a mean value of 16%, which corresponds to a degradation of 10% 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. Further studies should provide a confirmation of this tendency.
Filiaciones:
SÁnchez L.J.:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70-264, Cd. Universitaria, 04510 México DF, Mexico
Cruz D.X.:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70-264, Cd. Universitaria, 04510 México DF, Mexico
Avila R.:
Centro de Radioastronomía y Astrofísica, Universidad Nacional Aut´onoma de ?exico, Campus Morelia, Apartado Postal 3-72, 58090 Morelia, MichoacÁn, Mexico
Agabi A.:
U.M.R. 6525 Astrophysique, Université de Nice-Sophia Antipolis/CNRS, Parc Valrose, 06108 Nice Cedex 2, France
Azouit M.:
U.M.R. 6525 Astrophysique, Université de Nice-Sophia Antipolis/CNRS, Parc Valrose, 06108 Nice Cedex 2, France
Cuevas S.:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70-264, Cd. Universitaria, 04510 México DF, Mexico
Garfias F.:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70-264, Cd. Universitaria, 04510 México DF, Mexico
GonzÁlez S.I.:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70-264, Cd. Universitaria, 04510 México DF, Mexico
Harris O.:
Instituto de Astronomía, Observatorio Astronómico Nacional, UNAM, Apdo. Postal 877, 22800 Ensenada, BC, Mexico
Masciadri E.:
Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
Orlov V.G.:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70-264, Cd. Universitaria, 04510 México DF, Mexico
Vernin J.:
U.M.R. 6525 Astrophysique, Université de Nice-Sophia Antipolis/CNRS, Parc Valrose, 06108 Nice Cedex 2, France
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