Atmospheric Secondary Particles In Near Earth Space
  The Alpha Magnetic Spectrometer detects a large amount of particles below rigidity cutoff. Those high energy particles create questions related to radiation belts and atmospheric neutrinos. To understand the origin of these particles, we use a trajectory tracing program to simulate particle trajectories in realistic geomagnetic field. The complex behaviors and large e^+/e^- are explained here. 
Ming-Huey A. Huang (Institute of Physics, Academia Sinica, Taipei,   Taiwan)