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

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...

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Guardado en:
Detalles Bibliográficos
Autores principales: Dova, María Teresa, Gómez Albarracín, Flavia Alejandra, Hansen, Patricia María, Jarne, Cecilia Gisele, Mariazzi, Analisa Gabriela, Moreno, Juan Cruz, Sciutto, Sergio Juan, Wahlberg, Hernán Pablo, The Pierre Auger Collaboration
Formato: Articulo Preprint
Lenguaje:Español
Publicado: 2011
Materias:
Ciencias Exactas
Física
Geomagnetic field
Extensive air showers
Cosmic rays
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/128831
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario: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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