Abstract
The development of turbulence under the energy feed of diffuse backstreaming ions upstream of quasi-parallel (QP) shocks is investigated using two-dimensional (2D) hybrid simulations involving the injection of a very hot ion beam against a cold incident ion flow. The waves attempt to propagate upstream but are convected back toward the shock by the incident flow and strongly grow in amplitude as they encounter larger beam densities. Pulsations are formed which are very similar to the short large amplitude magnetic structures (SLAMS) observed upstream of the Earth's bow shock. It is shown that SLAMS induce slowing and heating of the incident flow and play an active role in the shock transition.
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