The new Extremely Large Telescope projects need accurate evaluation of the candidate sites. In this work we present the seeing, free seeing and isoplanatic angle comparison between Aklim site located in Moroccan Anti- Atlas at the geographic coordinates 30°7'39" N, 08 18'39" W, and the Observatorio del Roque de Los Muchachos (ORM), located in La Palma, Canary Islands, at 28°45'00 N, 17°53”10 W, the both sites are pre-selected to house the E-ELT. In this work we present the seeing statistics of (Ɛ), the free seeing (Ɛ free) and the isoplanatic angle ϴ0 measurements at each site, statistics of the mentioned parameters are obtained from the whole data recorded from 09 May 2008 to 09 November 2009 using the Multi Aperture Scintillation Sensor (MASS) - Differential Image Motion Monitor (DIMM) system, compare the common data between the tow sites, more representative results and statistics are shown hereafter.
In this paper we present an analysis of the statistical and temporal properties of seeing and isoplanatic angle measurements obtained with combined Differential Image Motion Monitor (DIMM) and Multi-Aperture Scintillation Sensor (MASS) at Jbel Aklim candidate site for the Eauropean Extremely Large Telescope (E-ELT). These data have been collected from February 2008 to Jun 2010. The overall seeing statistics for Jbel Aklim site are presented, broken into total seeing, free atmosphere seeing and isoplanatic angle, and ground-layer seeing (difference between the total and free-atmosphere seeing). We examine the statistical distributions of seeing measurements and investigate annual and nightly behavior. The properties of the seeing measurements are discussed in terms of the geography and meteorological conditions at Jbel Aklim site.
We present a characterization of meteorological parameters: Wind and direction speed, temperature, relative
humidity and pressure. Data set is provided by the system of NCEP/NCAR Re-analysis. The statistical
treatment of data will cover the years between 2003 and 2006 for the Observatory Oukaïmeden. An analysis of
monthly, seasonal, and annual results is presented. We calculated the Richardson number for each month of the
year. In addition, this paper describes a comparison between balloon-sounding made at different stations and
coincident model-based meteorological analysis. The comparison allows the assessment reliability of the analysis
in studied period.
In the framework of the E-ELT project a prospecting campaign was launched by the ESO to select the site that
will host the next generation of optical telescopes of 42 m diameter. Moroccan Anti-Atlas (Jbel Aklim) was
selected as well as other sites (ORM, Ventarrones and Macon) to be a possible potential location that will house
the E-ELT. In this paper we first present the reasons for the choice of Jbel Aklim as a E-ELT candidate through
various exploration campaigns that we have achieved. The second part concerns description of instruments used.
Finally we will present the preliminary results of the meteorological and MASS-DIMM measurements.
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