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Estimating a cosmic ray detector exposure sky map under the hypothesis of seasonal and diurnal effects factorization
Santos E.M., Bonifazi C., Letessier-Selvon A.
http://hal.in2p3.fr/in2p3-00271816
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
Planète et Univers/Astrophysique
Estimating a cosmic ray detector exposure sky map under the hypothesis of seasonal and diurnal effects factorization
E.M. Santos1, C. Bonifazi1, A. Letessier-Selvon1
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
http://www-lpnhep.in2p3.fr
CNRS : UMR7585 – IN2P3 – Université Pierre et Marie Curie (UPMC) - Paris VI – Université Paris VII - Paris Diderot
Barre 12-22, 1er étage 4 Place Jussieu 75252 Paris Cedex 05
France
The measurement of large scale patterns or anisotropies in the arrival direction of high energy cosmic rays is an important step towards the understanding of their origin. Such measurements rely on an accurate estimation of the detector relative exposure in each direction on the sky : the coverage map. To reach an accuracy on the determination of this map below the one percent level one must properly identify and correct for all the environmental effects that may induce variations in the detector exposure as a function of time. In an approach, similar to the one used in anti-sidereal time analysis, we propose a method to empirically estimate and correct for those effects under the hypothesis that seasonal and diurnal variations can be factorized. We tested this method using a model ground detector of cosmic ray air showers, whose aperture varies due to the dependence of the air shower development on the atmospheric conditions.

Pré-publications
2008

95.85.Ry, 96.50.sd, 98.70.Sa
7 pages, 5 figures, submitted to Astropart. Phys
Large scale anisotropy – Coverage map – Cosmic rays – EAS-extensive air showers

Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0804.1533