Simulation of a CME-driven shock by multiple scattering angular distributions

Wang Xin, wangxin@nao.cas.cn, National Astronomical Observatories, Chinese Academy of Sciences, China
Yan Yihua, National Astronomical Observatories, Chinese Academy of Sciences

Abstract
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 model for explaining the presence of such solar energetic particles. For discussing the impact of a scattering angular distribution on the energy spectral shape of the CME-driven shock in the heliosphere, we perform multiple scattering angular distribution Monte Carlo simulations of the 14-Dec-2006 CME-driven shock. The simulated results of the subtle shock structures, energy translation processes, and energy spectra are presented. We find the correlation of the energy spectra with the energy translation processes which are dominated by the multiple scattering angular distributions. Simultaneously, we investigate that the simulated energy spectra with a single ``power-law" are consistent with the observed energy spectrum in the energy range up to MeV.