Computer Modeling of Test Particle Acceleration at Oblique Shocks
Abstract
We review the basic techniques and results of numerical codes used to model the acceleration of charged particles at oblique, fastmode, collisionless shocks. The emphasis is upon models in which accelerated particles (ions) are treated as test particles, and particle dynamics is calculated by numerically integrating along exact phasespace orbits. We first review the case where ions are sufficiently energetic so that the shock can be approximated by a planar discontinuity, and where the electromagnetic fields on both sides of the shock are defined at the outset of each computer run. When the fields are uniform and static, particles are accelerated by the scatterfree drift acceleration process at a single shock encounter. We review the characteristics of scatterfree drift acceleration by considering how an incident particle distribution is modified by interacting with a shock. Next we discuss drift acceleration when magnetic fluctuations are introduced on both sides of the shock, and compare these results with those obtained under scatterfree conditions. We describe the modeling of multiple shock encounters, discuss specific applications, and compare the model predictions with theory. Finally, we review some recent numerical simulations that illustrate the importance of shock structure to both the ion injection process and to the acceleration of ions to high energies at quasiperpendicular shocks.
 Publication:

Space Science Reviews
 Pub Date:
 September 1988
 DOI:
 10.1007/BF00226009
 Bibcode:
 1988SSRv...48..195D
 Keywords:

 Computerized Simulation;
 Interplanetary Space;
 Oblique Shock Waves;
 Particle Acceleration;
 Shock Wave Interaction;
 Solar Corona;
 Charged Particles;
 Electromagnetic Fields;
 Ion Accelerators;
 Ion Temperature;
 Space Sciences (General)