Computer Science
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..264..364k&link_type=abstract
In: Particle acceleration in cosmic plasmas; Proceedings of the Workshop, Bartol Research Inst., Newark, DE, Dec. 4-6, 1991 (A93
Computer Science
Cosmic Rays, Energetic Particles, Ionic Diffusion, Particle Acceleration, Shock Wave Interaction, Solar Wind, Computerized Simulation, Data Simulation
Scientific paper
The acceleration of ions at quasi-parallel collisionless shocks is examined via large-scale hybrid simulations. It is shown that the diffuse ions are accelerated out of the thermal population by a 'one-step' process up to about 12 times the shock ram energy. Above this energy the ions interact more than once with the shock, i.e., a first-order Fermi process is necessary for further acceleration. The shape of the downstream spectrum (omnidirectional differential flux) near the high-energy end is close to E exp -1, as predicted by Fermi theory. It is also shown that for quasi-parallel shocks the average relative amplitude of the upstream waves reaches values of 0.6. Simulation results also show that the upstream diffuse ions are not leakage ions, but predominantly originate from direct acceleration of the particles out of the incident solar wind distribution at the shock.
Kucharek Harald
Scholer Manfred
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