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Geomagnetic effects on cosmic ray propagation for different conditions

Published online by Cambridge University Press:  05 July 2012

Jimmy J. Masías-Meza ,
Xavier Bertou  and
Sergio Dasso
Jimmy J. Masías-Meza
Affiliation:
Centro Atómico Bariloche (CNEA-CONICET), U.N. de Cuyo, Bariloche, Rio Negro, Argentina email: masiasmj@ib.cnea.gov.ar, bertou@cab.cnea.gov.ar
Xavier Bertou
Affiliation:
Centro Atómico Bariloche (CNEA-CONICET), U.N. de Cuyo, Bariloche, Rio Negro, Argentina email: masiasmj@ib.cnea.gov.ar, bertou@cab.cnea.gov.ar
Sergio Dasso
Affiliation:
Instituto de Astronomía y Física del Espacio (UBA-CONICET) yDepartamento de Física (FCEN-UBA), Buenos Aires, Argentina email: dasso@df.uba.ar
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Abstract

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The geomagnetic field (Bgeo) sets a lower cutoff rigidity (Rc) to the entry of cosmic particles to Earth which depends on the geomagnetic activity. From numerical simulations of the trajectory of a proton (performed with the MAGCOS code) in the Bgeo, we use backtracking to analyze particles arriving at the Auger Observatory location. We determine the asymptotic trajectories and the values of Rc in different incidence directions. Simulations were done using several models of Bgeo that emulate different geomagnetic conditions.

Keywords

cosmic raysSun: magnetic fields

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