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Advances in Astronomy
Volume 2011, Article ID 471094, 6 pages
http://dx.doi.org/10.1155/2011/471094
Research Article

Modeling of the Near-Earth Low-Energy Antiproton Fluxes

1Divisão de Astrofísica, Instituto Nacional de Pesquisas Espaciais (DAS-INPE), 12227-010 São José dos Campos, SP, Brazil
2Department of Cosmogeophysics, Space Research Institute, Russian Academy of Sciences (IKI RAS), Moscow 117997, Russia

Received 27 August 2011; Revised 12 December 2011; Accepted 13 December 2011

Academic Editor: Gary Wegner

Copyright © 2011 U. B. Jayanthi and A. A. Gusev. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The local interstellar antiproton spectrum is simulated taking into account antineutron decay, (He,p) interaction, secondary and tertiary antiproton production, and the solar modulation in the “force field” approximation. Inclusive invariant cross-sections were obtained through a Monte Carlo procedure using the Multistage Dynamical Model code simulating various processes of the particle production. The results of the simulations provided flux values of 4 1 0 3 to 1 0 2 and 1 0 2 to 1 . 7 1 0 2 antiprotons/( 𝑚 2 s sr GeV) at energies of 0.2 and 1 GeV, respectively, for the solar maximum and minimum epochs. Simulated flux of the trapped antiprotons in the inner magnetosphere due to galactic cosmic ray (GCR) interactions with the atmospheric constituents exceeds the galactic antiproton flux up to several orders. These simulation results considering the assumptions with the attendant limitations are in comprehensive agreement with the experimental data including the PAMELA ones.