Dr. Abdelouahed Abahamid Profile

Dr. Abdelouahed Abahamid

at Univ Cadi Ayyad

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Publications (4)

Proceedings Article | 28 July 2014 Paper

Photometric study of the Paranal observatory using MASS database

A. Abahamid, M. Sarazin, G. Lombardi

Proceedings Volume 9147, 91478S (2014) https://doi.org/10.1117/12.2066652

KEYWORDS: Stars, Mass attenuation coefficient, Observatories, Databases, Aluminium phosphide, Scintillation, Astronomy, Turbulence, Atmospheric scintillation, Error analysis

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The atmospheric extinction is an important parameter for an astronomical site. The extinction directly affects the observations reducing the available radiation, but the most relevant effect on the quality of the astronomical data is the variation of the extinction across the sky and in the course of the observation at night. The aim is to trace the atmospheric transparency at any astronomical site using MASS data. The main goal of the present work is estimating the atmospheric extinction coefficient (mag/airmass) from MASS database. Multi Aperture Scintillation Sensor called MASS is an instrument to measure the vertical distribution of turbulence in terrestrial atmosphere by analyzing the scintillation of bright stars. Here we are briefly reminding you of the principles of a MASS instrument and presenting also the detailed description of the output data. In order to gain better understanding of the atmospheric photometry, we compute the atmospheric extinction coefficient, its rms, and the associated information from MASS database using the evolution of flux values of a star measured at ground level versus air mass which accounts for the flux loss. The technique used is based on the Bouguer low. To treat the statistics data correctly and compute the correct extinction, one has to know the filter. Correct value of the extinction is critical at most. For this reason, the atmospheric extinction must be extracted only by good measurements. We then used the quality control of MASS data. Also, in the current paper, we focus on the evaluation of nocturnal atmospheric extinction coefficient (mag/airmass) and others statistics (time of acquisition, accumulation time, air mass, and HR number is used as a star name only for information . . .) at Paranal observatory (70°24’05” W, 24°37’24” S, altitude 2635 m a.s.l, in Chile.). In addition, the rms error of the coefficient has been calculated. It is absolutely needed to evaluate the accuracy of each extinction measurement. For the first time, they were obtained from MASS database photo metric processing during 885 nights in the years 2004, 2005, 2006 and 2007. These results will almost lead to complete its characterization. The project is implemented in the frame of the European Southern Observatory contract No. PO 014190/HNEU.

Proceedings Article | 7 August 2010 Paper

Meteorological parameters analysis above Oukaimeden Observatory using NCEP/NCAR data

Y. Hach, M. Sabil, Z. Benkhaldoun, A. Benhida, A. Jabiri, A. Habib, A. Abahamid, A. Bounhir

Proceedings Volume 7733, 77334R (2010) https://doi.org/10.1117/12.856587

KEYWORDS: Turbulence, Meteorology, Mars, Temperature metrology, Data modeling, Observatories, Atmospheric modeling, Atmospheric optics, Statistical analysis, Reliability

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Proceedings Article | 28 September 2004 Paper

OWL site survey: first seeing measurement with ADIMM

Zouhair Benkhaldoun, Abdelouahed Abahamid, Youssef El Azhari, El Arbi Siher

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.548839

KEYWORDS: Telescopes, Astronomy, Optical turbulence, Turbulence, Motion measurement, Wavefronts, Cameras, Stars, Time metrology, Atmospheric optics

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Proceedings Article | 28 September 2004 Paper

Optical turbulence outer scale and coherence outer scale at different astronomical sites

Abdelouahed Abahamid, Jean Vernin, Abdelhadi Jabiri, Zouhair Benkhaldoun

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.551533

KEYWORDS: Optical turbulence, Astronomy, Global system for mobile communications, Atmospheric optics, Stereolithography, Coherence (optics), Wavefronts, Spatial coherence, Temperature metrology, Refractive index

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