Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh54a..04k&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH54A-04
Astronomy and Astrophysics
Astrophysics
7513 Coronal Mass Ejections (2101), 7514 Energetic Particles (2114), 7524 Magnetic Fields
Scientific paper
Gradual solar energetic particle (SEP) events are believed to be accelerated at CME driven shocks. Shocks driven by a realistic CMEs are neither simply quasi-perpendicular nor quasi-parallel: the geometry and the shock strength may constantly change as the CME evolves. The shock is likely to be quasi-perpendicular when it forms and becomes more parallel at later stages (Tylka and Lee, 2006). The downstream sheath region immediately behind the shock has a structure of its own, which may play a significant role in the SEP acceleration process. We present numerical simulations adopting a Lagrangian scheme which is designed to handle the evolution of the shock. The scheme follows the moving magnetic field lines, which are wrapped around the expanding CME, and are pushed by the ejecta. We present numerical simulation results and discuss their implications. Tyka, A,J, and M.A. Lee, Astrophys. ~J., 646, 1319 (2006)
Giacalone Joe
Jokipii Randy J.
Kota József
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