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Proceedings Paper

A study of the aerosol extinction from ground-based dust measurements at ORM
Author(s): G. Lombardi; V. Zitelli; S. Ortolani; M. Pedani; A. Ghedina
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Paper Abstract

We present an analysis of the atmospheric dust content and its effects on astronomical observations at Observatorio del Roque de Los Muchachos (ORM), in La Palma Island (Canaries). We have detected atmospheric particles having size 0.3, 0.5, 1.0 and 5.0 μm, closer to Telescopio Nazionale Galileo (TNG) dome and using a power law we have derived the content of 10.0 µm particles. Using a model we have calculated the contribute of aerosols to astronomical extinction in B, V and I from a 5 years series database in two typical conditions: clear and dusty days. A correlation is also analysed comparing the aerosol extinction and total astronomical extinction using the Carlsberg Automatic Meridian Circle (CAMC) extinction database in V. We have estimated that the dust reach an altitude of about 5 km above the sea level during the sand storms. Finally we have concluded that in the visible band extension is dominated by particles at 1.0, 5.0, and 10.0 μm.

Paper Details

Date Published: 10 July 2008
PDF: 10 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 701241 (10 July 2008); doi: 10.1117/12.787846
Show Author Affiliations
G. Lombardi, Univ. of Bologna (Italy)
INAF, Bologna Astronomical Observatory (Italy)
European Southern Observatory (Chile)
V. Zitelli, INAF, Bologna Astronomical Observatory (Italy)
S. Ortolani, Univ. of Padova (Italy)
M. Pedani, Large Binocular Telescope Observatory, Univ. of Arizona (United States)
A. Ghedina, Fundación Galileo Galilei and Telescopio Nazionale Galileo (Spain)

Published in SPIE Proceedings Vol. 7012:
Ground-based and Airborne Telescopes II
Larry M. Stepp; Roberto Gilmozzi, Editor(s)

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