Modeling a mixed SEP event with the PATH model: December 13, 2006

Details Modeling a mixed SEP event with the PATH model: December 13, 2006 Modeling a mixed SEP event with the PATH model: December 13, 2006

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1039..214v&link_type=abstract

PARTICLE ACCELERATION AND TRANSPORT IN THE HELIOSPHERE AND BEYOND: 7th Annual International Astrophysics Conference. AIP Confer

Astronomy and Astrophysics

Astrophysics

2

Astronomical Observations, Particle Acceleration, Flares, Particle Emission, Solar Wind, Interplanetary Magnetic Fields, Planetary Bow Shocks, Interplanetary Shocks, Magnetohydrodynamics And Plasmas, Turbulence

Scientific paper

There are often two particle components which form a major SEP event, one originating from a solar flare and the other from solar wind particles accelerated at a traveling CME-driven shock [1]. If a CME and a flare are part of the same process, then the interplay between corresponding energetic particle components may yield temporal, spectral, and compositional differences in observations. Depending on spacecraft location and magnetic connection to either a flare site or a CME-driven shock (or both), we expect to observe distinct signatures in the time intensity profiles. Following an approach by Li and Zank [2], we apply the Particle Acceleration and Transport in the Heliosphere (PATH) one-dimensional numerical code developed at University of California in Riverside to model the mixed SEP event of December 13, 2006. We initiate the code by modeling a quiet-time solar wind. Observed shock parameters at 1 AU and flare characteristics then are used as input into the code. We model energetic particle acceleration at a traveling quasi-parallel CME-driven shock and subsequent transport throughout the interplanetary medium to 1 AU. Time-intensity profiles and spectra of proton and heavy ions are presented and compared with in situ measurements by ACE. Contributions from the solar wind suprathermal and flare particles to the resultant SEP event are discussed.

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