The global transport of energetic particles in the heliospheric magnetic field

Details The global transport of energetic particles in the heliospheric magnetic field The global transport of energetic particles in the heliospheric magnetic field

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh72b..02g&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH72B-02

Physics

2114 Energetic Particles, Heliospheric (7514), 2118 Energetic Particles, Solar, 2134 Interplanetary Magnetic Fields, 7807 Charged Particle Motion And Acceleration, 7863 Turbulence

Scientific paper

We present new results from modeling the global propagation of energetic particles (greater than ~ 50 keV) in the heliosphere. Our models are applied to the interpretation of some observed events which provide information about the large-scale heliospheric magnetic field itself. Examples include the recurrent particle events at high heliographic latitudes associated with corotating interaction regions at lower latitudes, impulsive solar-flare events showing fine-scale intensity variations at 1 AU, and large global events, such as the one which occured on Bastille day, 2001. We show that the the diffusion of charged particles across the average magnetic field naturally explains many of the observed features of particle events. The physics of cross-field diffusion and the effect of field-line braiding and meandering on the particle diffusion are discussed. Additionally, we compare the results from the brute-force numerical integration of particle trajectories in synthesized magnetic fields with a cosmic-ray transport model in order to determine transport coefficients. We also discuss the constraints imposed by the observations of both the heliospheric magnetic field and the particles in the context of existing models.

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