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Proceedings Paper

Correlation between TOMS aerosol index and astronomical extinction
Author(s): El Arbi Siher; Sergio Ortolani; Marc S. Sarazin; Zouhair Benkhaldoun
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Paper Abstract

We combined aerosol index measurements of TOMS/Nimbus-7 and Earth Probe observations with CAMC visual extinction over La Palma from 1984 to 1997, to investigate the possibility to calibrate TOMS data in terms of astronomical extinction. The results show that the correlation of the two sets of data is quite good for extinction values greater than about Av = 0.2 mag./airmass. A detailed analysis reveals that the satellite aerosol index is indeed sensitive to the desert dust, but does not show evidence of the extinction contribution of the volcanic smoke due to the Mt. Pinatubo eruption which affected astronomical observations in 1992-1993. This calibrated aerosol index is then used to investigate the number and distribution of dusty events over the astronomical site of Oukaimeden, Morocco. We find a remarkable correlation of the extinction over the two sites. Finally we study the long term variability of the extinction over the region including Oukaimeden and La Palma, and we conclude that there is some correlation with the Northern Atlantic Oscillation.

Paper Details

Date Published: 28 September 2004
PDF: 8 pages
Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); doi: 10.1117/12.549804
Show Author Affiliations
El Arbi Siher, Univ. Cadi Ayyad (Morocco)
Sergio Ortolani, Univ. degli Studi di Padova (Italy)
Marc S. Sarazin, European Southern Observatory (Germany)
Zouhair Benkhaldoun, Univ. Cadi Ayyad (Morocco)

Published in SPIE Proceedings Vol. 5489:
Ground-based Telescopes
Jacobus M. Oschmann, Editor(s)

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