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IOP Publishing, Journal of Cosmology and Astroparticle Physics, 11(2011), p. 022-022

DOI: 10.1088/1475-7516/2011/11/022

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The effect of the geomagnetic field on cosmic ray energy estimates and large scale anisotropy searches on data from the Pierre Auger Observatory

Journal article published in 2011 by Wjm de Mello, M. A. Leigui de Oliveira, W. Rodrigues de Carvalho, Rm M. de Almeida, Sj J. de Jong, Jrt R. T. de Mello Neto, L. del Peral, M. del Río, Kd D. de Vries, V. de Souza, J. C. dos Anjos, M. Zimbres Silva, Jf F. Valdés Galicia, J. R. Vázquez, B. Vargas Cárdenas and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We present a comprehensive study of the influence of the geomagnetic field on the energy estimation of extensive air showers with a zenith angle smaller than 60°, detected at the Pierre Auger Observatory. The geomagnetic field induces an azimuthal modulation of the estimated energy of cosmic rays up to the ~ 2% level at large zenith angles. We present a method to account for this modulation of the reconstructed energy. We analyse the effect of the modulation on large scale anisotropy searches in the arrival direction distributions of cosmic rays. At a given energy, the geomagnetic effect is shown to induce a pseudo-dipolar pattern at the percent level in the declination distribution that needs to be accounted for. ; CNPq ; FINEP ; FAPERJ ; FAPESP ; MCTI ; Entre outras