Ion acceleration at parallel shocks: Self-consistent plasma simulations

Details Ion acceleration at parallel shocks: Self-consistent plasma simulations Ion acceleration at parallel shocks: Self-consistent plasma simulations

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.346...65g&link_type=abstract

In ESA, Study of the Solar-Terrestrial System p 65-70 (SEE N93-31674 12-90)

Statistics

Computation

11

Collisionless Plasmas, Magnetohydrodynamic Waves, Particle Acceleration, Plasma Turbulence, Shock Fronts, Shock Waves, Computational Astrophysics, Computerized Simulation, Magnetic Fields, Particle Diffusion

Scientific paper

The acceleration of ions by a collisionless shock wave is addressed. Shocks which propagate in the same direction as the average magnetic field are considered. This method utilizes self consistent plasma simulations which effectively models the initial acceleration of thermal plasma particles (the extraction process), the subsequent scattering off of the upstream and downstream turbulence (Fermi acceleration), local drift acceleration episodes at the shock front, and the feedback effect of the energetic particles in the overall behavior of the shock. The hybrid simulation model is employed which treats the ions individually and the electrons as a massless, charge neutralizing fluid. To improve statistics at high energy, where the distribution function falls off readily, a particle splitting algorithm is used. Moreover, a spectrum of Alfvenic turbulence in the background magnetic field is introduced. This mimics the role of turbulence upstream of shocks in scattering backstreaming particles as part of the Fermi process. The results are qualitatively compared with observations. Means for achieving direct comparisons are discussed.

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