We developed a test particle simulation code to examine the electron dynamics during multiple dipolarization substorm events detected by the THEMIS mission. Through the Tao-Chan-Brizard guiding center model, we evaluated the trajectories of 0.1, 1, and 10 keV electrons with different initial pitch angles and L-shells. 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. The particle flux and energy enhancements in the nighttime magnetosphere characterize dipolarization events. The increase in the magnetic field and the corresponding induced and polarized electric field energizes and transports the particles earthward, which can explain the mechanism of the particle flux enhancement in the inner magnetosphere.
