Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2011-11-30
JCAP11 (2011) 022
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
20 pages, 14 figures
Scientific paper
10.1088/1475-7516/2011/11/022
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 $60^\circ$, 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.
Abreu P.
Aglietta Marco
Agüera Lopez A.
Ahn Eun-Joo
Albarracin Gomez F.
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