We investigate the evolution of ion beams observed upstream of quasi-parallel shocks, produced typically by reflection at the cross-shock potential. Virtually all calculations of this problem assume a pristine environment into which the reflected beam streams, yet in reality we expect that the beam will propagate into a disturbed, turbulent region. In this study, we investigate the beam evolution in the presence of a pre-existing spectrum of Alfvenic low-frequency fluctuations based on a two and a half dimensional hybrid simulation. We analyze the effects of waves on ion beams and outline how the obtained picture is related to observations.
展开▼
