Modeling of Particle Acceleration and Transport in Gradual SEP Events Using the PATH Model

Details Modeling of Particle Acceleration and Transport in Gradual SEP Events Using the PATH Model Modeling of Particle Acceleration and Transport in Gradual SEP Events Using the PATH Model

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh44c..03v&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH44C-03

Physics

2139 Interplanetary Shocks, 2159 Plasma Waves And Turbulence, 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7845 Particle Acceleration, 7984 Space Radiation Environment

Scientific paper

We discuss Particle Acceleration and Transport in the Heliosphere (PATH) numerical model developed at University of California at Riverside and present current progress on modeling of energetic particle acceleration at a traveling quasi-parallel CME-driven shock. We initiate the code by modeling a quiet-time solar wind background and then follow the propagation and evolution of an MHD shock from a distance of ~0.1 AU to the Earth's orbit. The model utilizes the solar wind parameters measured in situ by ACE. A semi-analytical approach is applied to simulate particle acceleration at the shock by injecting solar wind suprathermal ions locally. The diffusive shock acceleration mechanism due to the ion scattering by Alfvenic turbulence in the vicinity of the shock is adopted in the code. Monte-Carlo approach is used to follow transport of the energetic particles after they escape from the shock. The output of the PATH model includes time-dependent energetic particle fluxes, spectra and compositional ratios (Fe/O) for proton and heavy ions. We model specific SEP events and compare our modeling results with ACE measurements.

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