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Author
Pierre Auger Collaboration (Abreu, P. et al)
;
Pastor, S.
Title
The effect of the geomagnetic field on cosmic ray energy estimates and large scale anisotropy searches on data from the Pierre Auger Observatory
Type
Journal Article
Year
2011
Publication
Journal of Cosmology and Astroparticle Physics
Abbreviated Journal
J. Cosmol. Astropart. Phys.
Volume
11
Issue
11
Pages
022
Keywords
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 degrees, detected at the Pierre Auger Observatory. the geomagnetic field induces an azimuthal modulation of the estimated energy of cosmic rays up to the similar to 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.
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ISSN
1475-7516
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Notes
WOS:000298141300022
Approved
no
Is ISI
yes
International Collaboration
yes
Call Number
IFIC @ elepoucu @
Serial
865
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