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Bessho, N.; Chen, L.-J.; Shuster, J. R.; Wang, S.
Geophysical research letters, 28 December 2014, Letnik: 41, Številka: 24Journal Article
Highly structured electron distribution functions in the electron diffusion region (EDR) during magnetic reconnection are studied by means of fully kinetic simulations. Four types of structures (striations, arcs, swirls, and rings) in momentum space are analyzed to understand their formation mechanisms. Discrete striations are formed by particles undergoing different numbers of meandering bounces in the EDR and are a result of oscillations in the out‐of‐plane force on meandering electrons. Predictions for the separation between striations and the triangular shape of the distribution are obtained analytically. Arcs and swirls are due to partial remagnetization of accelerated electrons. Near the end of the outflow jet, electron remagnetization gives rise to the ring structure. Understanding the distribution structures is critical to unraveling the kinetic processes occurring in the EDR and will guide the identification of EDRs based on satellite measurements. Key PointsOscillating Lorentz force in bounce motion causes striations in distributionsA triangular distribution is formed due to particle motion in the neutral planeArcs, swirls, and rings are formed as electrons are gradually magnetized
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