Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh31a1449b&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH31A-1449
Physics
Plasma Physics
[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7845] Space Plasma Physics / Particle Acceleration, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
Acceleration in coronal and interplanetary CME-driven shocks is currently considered the primary source of large solar energetic particle (SEP) intensities. In large SEP events, the particles accelerated at the shock generate Alfvénic turbulence in the ambient medium, which facilitates particle trapping and repeated shock crossings, thus bootstrapping the acceleration process. In order to study this process, we have developed a Monte Carlo simulation method, where particles are traced in prescribed large-scale electromagnetic fields utilizing the guiding center approximation. In our simulations, particles are scattered in the turbulence according to quasilinear theory, with the scattering amplitude directly proportional to the intensity of Alfvén waves at gyro-resonant wavenumbers. The Alfvén waves are traced simultaneously with the particles, so that the wave field is propagated outwards from the Sun using WKB propagation supplemented with a phenomenological wavenumber diffusion term and a growth rate computed from the net flux of the accelerated particles. We have previously reported on effects of decreasing shock velocity and shocks propagating with various shock-normal angles. In these studies, we have discovered that the injection energy of particles clearly affects the efficiency of the acceleration process, which complicates the effort of isolating the effects of other parameters in the overall structure of the shock and the coronal environment the shock travels through. We now extend our study by varying the spectral and radial injection profile, specifically injecting pre-heated particles, allowing us to better assess the separate effects of shock obliquity and injection energy on SEP acceleration.
Agueda Neus
Battarbee M. C.
Laitinen T. L.
Vainio Rami O.
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