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Non-Maxwellian electron velocity space distribution functions (EVDF) areuseful signatures of plasma conditions and non-local consequences ofcollisionless magnetic reconnection. In the past, EVDFs were obtained mainlyfor antiparallel reconnection and under the influence of weak guide-fields inthe direction perpendicular to the reconnection plane. EVDFs are, however, notwell known, yet, for oblique (or component-) reconnection in dependence onstronger guide-magnetic fields and for the exhaust (outflow) region ofreconnection away from the diffusion region. In view of the multi-spacecraftMagnetospheric Multiscale Mission (MMS), we derived the non-Maxwellian EVDFs ofcollisionless magnetic reconnection in dependence on the guide-field strength$b_g$ from small ($b_g\approx0$) to very strong ($b_g=8$) guide-fields, takinginto account the feedback of the self-generated turbulence. For this sake, wecarried out 2.5D fully-kinetic Particle-in-Cell simulations using the ACRONYMcode. We obtained anisotropic EVDFs and electron beams propagating along theseparatrices as well as in the exhaust region of reconnection. The beams areanisotropic with a higher temperature in the direction perpendicular ratherthan parallel to the local magnetic field. The beams propagate in the directionopposite to the background electrons and cause instabilities. We also obtainedthe guide-field dependence of the relative electron-beam drift speed, thresholdand properties of the resulting streaming instabilities including the stronglynon-linear saturation of the self-generated plasma turbulence. This turbulenceand its non-linear feedback cause non-adiabatic parallel electron accelerationand EVDFs well beyond the limits of the quasi-linear approximation, producingphase space holes and an isotropizing pitch-angle scattering.

Non-Maxwellian electron distribution functions due to self-generated turbulence in collisionless guide-field reconnection