  Observations of the interplanetary shock provide us with strong evidence of
particle acceleration to multi-MeV energies, even up to GeV energy, in a solar
flare or coronal mass ejection (CME). Diffusive shock acceleration is an
efficient mechanism for particle acceleration. For investigating the shock
structure, the energy injection and energy spectrum of a CME-driven shock, we
perform dynamical Monte Carlo simulation of the 14-Dec-2006 CME-driven shock
using an anisotropic scattering law. The simulated results of the shock fine
structure, particle injection, and energy spectrum are presented. We find that
our simulation results give a good fit to the observations from multiple
spacecraft.
