Secondary electrons and positrons in near earth orbit

Abstract

The secondary e+ and e- populations in near earth's orbit have been calculated by simulation. The results are in very good agreement with the recent AMS measurements. The e${}^{+}$ over e${}^{-}$ flux ratio for particles below the geomagnetic cutoff appears to be due to the geomagnetic East-West effect.

Final version for Phys. Lett. B: Title changed, new references added, minor changes in text

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