6 August 2010 New dust measurements at ORM, and comparison with Paranal Observatory
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Abstract
The performances of a modern telescope and its safety are dependent on the presence of atmospheric dust. The TNG telescope at ORM (Canary Islands) was one of the first sites monitored on a continuous basis by an automatic dust monitor. This paper presents the analysis of about 10 years of atmospheric dust content collected at the ORM using the TNG facilities. We have detected particles of 0.3, 0.5, 1.0, 3.0, 5.0 and 10.0 μm size. In this study particles of 0.5 and 5.0 μm measured at Paranal Observatory (Chile) are also compared to those similar at TNG. The seasonal behavior of the particles content in the atmosphere is compared between the two sites. The contribution of the dust emissivity to the sky brightness in the NIR is computed for the first time. To complete this study we defined the aerosol mass critical limit to be used as a safety limit for the observations. We found a limit of 12 μg m-3 as total mass of (0.5 + 5.0) μm particles.
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G. Lombardi, G. Lombardi, V. Zitelli, V. Zitelli, S. Ortolani, S. Ortolani, A. Ghedina, A. Ghedina, A. Garcia, A. Garcia, E. Molinari, E. Molinari, C. Gatica, C. Gatica, } "New dust measurements at ORM, and comparison with Paranal Observatory", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77334G (6 August 2010); doi: 10.1117/12.856981; https://doi.org/10.1117/12.856981
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