  We used a backtracing code to reconstruct particle trajectory inside the
Earth Magnetosphere during the last solar active period (2011 and 2012) when
very high Solar Wind pressure values were measured. We compared our results on
AMS-02 proton and electron data with 2 different External Field models, namely
Tsyganenko 1996 (T96) and 2005 (T05), both for quiet (defined as the periods
when the solar wind pressure is below the average value, set at 2nPa) and
active periods. Although T05 has been specifically designed for storm events,
at high energy the particle trajectory is similar for the two models. For
instance at rigidities larger than 50 GV, the RMS of angular difference between
reconstructed asymptotic direction outside the Magnetosphere is of the order of
the millirad, while it increases at intermediate energies. We also confirmed,
as a function of the pointing direction, the well known East-West effect on the
trajectory of primary particles and on the access solid angle on the AMS
detector.
