Modeling the transport of protons and heavy ions in SEP events

Details Modeling the transport of protons and heavy ions in SEP events Modeling the transport of protons and heavy ions in SEP events

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh23c..07l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH23C-07

Other

7807 Charged Particle Motion And Acceleration, 7833 Mathematical And Numerical Techniques (0500, 3200), 7857 Stochastic Phenomena (3235, 3265, 4475), 7859 Transport Processes

Scientific paper

In Solar Energetic Particle (SEP) events, particles are accelerated at flares and/or shocks and propagate to 1 AU. Their propagation is affected by the MHD turbulence of the solar wind. Therefore a better understanding of these events (e.g. to obtain the injection profile at the Sun in impulsive SEP events) requires that we understand how charged particles interact with solar wind MHD turbulence. We report in this work our recent modeling effort of ion transport in SEP events for ions with a range of charge-to-mass ratios. We describe particle-turbulence interaction using an extended Quasi Linear Theory. A Monte-Carlo simulation following single particle motion that is based on the stochastic differential equation method is developed. Among other advantages over traditional finite difference method, our approach allows us to easily investigate the effect of an radial dependent diffusion coefficient (Duu) on the observed time intensity profile and spectra. Individual events are selected for modeling. Results and implications from our modeling are shown and discussed.

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