Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..231g&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 231-231
Astronomy and Astrophysics
Astronomy
Scientific paper
The numerical simulation of the antiproton fluxes trapped in the magnetosphere of the Earth show that significant fluxes of these antiparticles could exist here. They are secondary in origin, and are the products of nuclear reactions of the high energy primary cosmic rays (CR) with the constituents of the terrestrial atmosphere. Direct extraterrestrial antiprotons impinging upon the Earth's magnetosphere are themselves secondary in origin, i.e. they are born in nuclear reactions of the same CR passing through 5-7 g/cm2 of interstellar matter. These exhibit lower fluxes compared to the magnetospheric antiprotons which are produced in the passage of the same CR through the Earth's residual atmosphere of hundreds of g/cm2. Such locally generated antiprotons can be confined by the magnetic field of the Earth (or equivalently in any planet) and get accumulated in the magnetosphere. We present here the results of the numerical simulations of the production of the antiproton fluxes in the energy range from 10 MeV to several GeV in the Earth's atmosphere at altitudes of about 1000 km and further consider the radial diffusion process. We compare these antiproton fluxes in the magnetosphere with those produced in interstellar matter. The estimates presented herein show a significant excess (up to two orders of magnitude) of magnetospheric antiproton fluxes over those formed in the interstellar media at energies < 2 GeV. The radial diffusion process enlarges the spatial distribution in the radial direction (in the L space) essentially showing significant fluxes up to L»2.
Choque K.
Gusev Alexander A.
Jayanthi Udaya Bhaskaram
Pugacheva G.
Schuch Nelson Jorge
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