Scattering, injection and acceleration of field alignedbeam ions at quasi-parallel shock: a hybrid simulation study

The process of injection into the first-order Fermi acceleration, also called diffusive shock acceleration or DSA, at quasi-parallel shocks is still not completely understood. In our analysis, we study the scattering and the acceleration of field aligned beam ions in the foreshock region of a quasi-parallel shock by using a 1D hybrid simulation setup. Test particles are introduced into the simulation box in a developed foreshock wave field and these particles are followed until the end of the experiment. Our results show that more than 40% of the original FAB ions reach the shock and become accelerated to energies that are typical of diffuse ions. Keywords: collisionless plasma, diffusive shock acceleration, ion injection