Primary cosmic rays and trapped radiation as the sources of the positron fluxes in the earth's vicinity

Details Primary cosmic rays and trapped radiation as the sources of the positron fluxes in the earth's vicinity Primary cosmic rays and trapped radiation as the sources of the positron fluxes in the earth's vicinity

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.4200g&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

The production of positron and electron fluxes due to nuclear reactions of cosmic rays and trapped particles in the Earth's magnetosphere, is considered. It is supposed that positrons as well as electrons are mainly produced in the decay of charged pions, which are born in nuclear collisions of trapped relativistic inner zone protons with the residual atmosphere constituents. These positrons and electrons are captured in the magnetosphere and create positron and electron radiation belts of nuclear reaction origin. We simulated the positron and electron trapped magnetospheric fluxes as due to the radiation belt proton source modeled by AP-8 through reactions and decay schemes and obtained the e+/eflux ratios dependent on positron energy and close to ~ 4. However, this excess is absent when we considered the primary and secondary cosmic ray proton fluxes observed in equatorial region as a positron flux source in our simulations. Interestingly, the Alpha Magnetic Spectrometer (AMS) on board the space shuttle, in the equatorial region at altitudes of » 400 km (The AMS collaboration, 2000), registered quasi-trapped positron fluxes with intensities about 4 times higher than the electron fluxes at energies above 200 MeV and with e+ /eflux ratio dependent on positron energy. This agreement between the e+ /eflux ratio and its energy dependence calculated on the basis of AP-8 model and the AMS observations is good.

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