Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iauss...5e..31b&link_type=abstract
Astronomy for the Developing World, 26th meeting of the IAU, Special Session 5, 21-22 August, 2006 in Prague, Czech Republic, SP
Astronomy and Astrophysics
Astronomy
Scientific paper
The ELT project is currently underway in Europe and North America. Astronomical sites critically depend on sky transparency and then on aerosol loadings. A quantitative survey of aerosol optical properties at candidate sites is an essential part of the site selection process. There are basically two methods to scan and characterize aerosol properties: ground based measurements and satellite measurements. In this paper we will establish a full climatology of Two sites very close to each other but at a difference of 2300m of altitude. Izana and Santa-Cruz located in the canary Islands. Both have sun photometers from AERONET Network. AERONET provides a set of aerosol optical properties : Atmospheric optical thickness, aerosol optical thickness, angstrom parameter, aerosol size distribution, aerosol refraction index, single scattering albedo, water vapour content, phase function, direct sun radiance and sky radiance. We also use satellite data TOMS aerosol index The aim of this work is to see how these properties change with altitude.. We establish a correlation between TOMS index and the aerosol optical thickness in both sites. Aerosol optical properties show very good correlation between Izana and Santa-Cruz. As a result we establish a set of relationships helpful to characterize sites at altitude from data of neighbouring site. In the ELT site selection and evaluation process, a preliminary study from satellite measurements and from AERONET neighbouring sites is very important.
Benkhaldoun Zouhai
Bounhir Aziza
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