We developed a test particle simulation code to examine the electron dynamics during multiple dipolarization substorm events detected by the THEMIS mission. We evaluated the trajectories of 0.1, 1, and 10 keV electrons with different initial pitch angles and L-shells by implementing the Tao-Chan-Brizard guiding center model and the full Lorentz particle motion. We applied the Tsyganenko model TS05 and the IGRF-12 to generate the time-varying magnetic field model with the corresponding inductive and polarized electric fields. Our preliminary simulation results confirmed that the particle energies were enhanced in the nighttime magnetosphere during dipolarization events. We suggest that the increase in the magnetic field strength in the dipolarization event and the corresponding induced/polarized electric field energizes and transports the particles earthward, which may explain the mechanism of the particle flux enhancement in the inner magnetosphere.
