An Integrated CME-SEP Numerical Investigation of the 1998 May 1-2 CME Events Part III: SEP Abundance and Variability at 1AU

Details An Integrated CME-SEP Numerical Investigation of the 1998 May 1-2 CME Events Part III: SEP Abundance and Variability at 1AU An Integrated CME-SEP Numerical Investigation of the 1998 May 1-2 CME Events Part III: SEP Abundance and Variability at 1AU

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh23a0327t&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH23A-0327

Physics

2139 Interplanetary Shocks, 7845 Particle Acceleration, 7863 Turbulence (4490)

Scientific paper

Coronal mass ejections (CMEs), also known as solar eruptions, are regarded as the main drivers of many of the observed solar energetic particles (SEP). The shock wave driven by the ejecta can accelerate charged particles to ultra-relativistic energies as the result of Fermi acceleration processes. The most energetic particles can escape upstream of the shock, reaching the Earth shortly after the initiation of the CME. In this paper we study the SEP variability in the course of the 1998 May 1-2 events on the basis of kinetic numerical models. Both the direct integration of the kinetic equation and the direct simulation approaches have been utilized for solving the SEP acceleration and transport problem. We developed a coupled SEP-turbulence model to take into account excitation of turbulence by the self-generated Alfven waves and particle diffusion due to the enhanced turbulence in self consistent manner. It allows us to compute the SEP variability at 1 AU and compare it with the observational data. The numerical results for different sorts of ions are obtained. The abundances of heavy ions in SEP are compared with observations. The Monte Carlo method has been also applied to include both pinch-angle scattering and cross-field diffusion of particles into the SEP transport model.

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