Abstract
The diffusion of electrons across a magnetic field in the presence of a beam–plasma instability has been studied by means of two-dimensional numerical simulations. It is found that the beam electrons can diffuse much faster across the magnetic field than the thermal electrons. This can be explained by the fact that the electrons in the beam are in resonance with the waves excited by the beam–plasma instability so that they experience a nearly d.c. electric field, causing large cE×B/B2 excursions.
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