Crescent-shaped electron velocity distribution functions formed at the edges of plasma jets interacting with a tangential discontinuity
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In this paper we discuss numerical simulations that illustrate a physical mechanism leading to the formation of crescent-shaped electron velocity distribution functions at the edges of a high-speed plasma jet impacting on a thin, steep and impenetrable tangential discontinuity with no magnetic shear. We use three-dimensional particle-in-cell simulations to compute the velocity distribution function of electrons in different areas of the plasma jet and at different phases of the interaction with the discontinuity. The simulation set-up corresponds to an idealized, yet relevant, magnetic configuration likely to be observed at the frontside magnetopause under the northward interplanetary magnetic field. The combined effect of the gradient-B drift and the remote sensing of large Larmor radius electrons leads to the formation of crescent-shaped electron velocity distribution functions. We provide examples of such distributions "measured" by a virtual satellite launched into the simulation domain.
CitationVoitcu, G.; Echim, M. (2018). Crescent-shaped electron velocity distribution functions formed at the edges of plasma jets interacting with a tangential discontinuity. , Annales Geophysicae, Vol. 36, Issue 6, 1521-1535, DOI: 10.5194/angeo-36-1521-2018.