Nuclear Abundances and Fluxes inside the magnetosphere

At 1 AU and outside the Earth's magnetosphere, the abundances of He, C and Fe nuclei, relative to protons were calculated using the measurements of AMS-01 (for p and He) and HEAO-3 (for C and Fe). We applied the back-tracing method to obtain allowed and forbidden trajectories inside the magnetosphere using the IGRF and T96 models. In this way we have evaluated the transmission function for the GCR propagation inside the magnetosphere for several geomagnetic regions. Then we derived the primary GCR fluxes in the same geomagnetic regions. These fluxes were found in good agreement with the observation data. Furthermore inside the magnetosphere we obtain the relative abundances of He, C and Fe nuclei to protons. The relative isotopic abundances were found to depend on the mass number and range from a factor ∼ 2.3 up to ∼ 3.3 larger than those outside the magnetosphere. (authors)