Modeling SEP events from 0.5 to 3.0 AU with the PATH code

Details Modeling SEP events from 0.5 to 3.0 AU with the PATH code Modeling SEP events from 0.5 to 3.0 AU with the PATH code

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh31b2011a&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH31B-2011

Astronomy and Astrophysics

Astrophysics

[7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles

Scientific paper

We study the radial dependence of spectra, fluxes and the composition ratio in large SEP events. The Particle Acceleration and Transport in the Heliosphere (PATH) code is extended and modified to include shocks with an arbitrary angle between the upstream magnetic field and the shock normal. The model incorporates both flare particles and particles accelerated at a CME-driven shock and their subsequent propagation throughout the inner heliosphere. We assume that diffusive shock acceleration at the shock is responsible for particle energization at a shock wave and we model the subsequent transport of particles escaping from the shock through the interplanetary medium to 3 AU by using a Monte Carlo description. We model spectra and time-intensity profiles of protons, oxygen and iron ions. We numerically estimate the Fe/O abundance ratio. The focus of this study is on understanding the radial dependence of SEP parameters for shocks with different obliquities and flare contribution. Comparison is made of oblique, quasi-parallel and quasi-perpendicular shock cases. Our modeling results will be compared with multi-satellite in situ measurements for several SEP events

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