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For a Weibel shock to form, two plasma shells have to collide and trigger theWeibel instability. At saturation, this instability generates in theoverlapping region magnetic filaments with peak field $B_f$. In the absence ofan external guiding magnetic field, these filaments can block the incomingflow, initiating the shock formation, if their size is larger than the Larmorradius of the incoming particles in the peak field. Here we show that thisresults still holds in the presence of an external magnetic field $B_0$,provided it is not too high. Yet, for $B_0 \gtrsim B_f/2$, the filaments becomeunable to stop any particle, regardless of its initially velocity.

Particles trajectories in Weibel magnetic filaments with a flow-aligned magnetic field