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According to magnetohydrodynamics (MHD), the encounter of two collisionalmagnetized plasmas at high velocity gives rise to shock waves. Investigationsconducted so far have found that the same conclusion still holds in the case ofcollisionless plasmas. For the case of a flow-aligned field, MHD stipulatesthat the field and the fluid are disconnected, so that the shock produced isindependent of the field. We present a violation of this MHD prediction whenconsidering the encounter of two cold pair plasmas along a flow-alignedmagnetic field. As the guiding magnetic field grows, isotropization isprogressively suppressed, resulting in a strong influence of the field on theresulting structure. A micro-physics analysis allows to understand themechanisms at work. Particle-in-cell simulations also support our conclusionsand show that the results are not restricted to a strictly parallel field.

Kinetic inhibition of MHD-shocks in the vicinity of a parallel magnetic field