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Parallel electric fields are inefficient drivers of energetic electrons in magnetic reconnection
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abstract
We present two-dimensional kinetic simulations, with a broad range of initial guide fields, that isolate the role of parallel electric fields ($E_\parallel$) in energetic electron production during collisionless magnetic reconnection. In the strong guide field regime, $E_\parallel$ drives essentially all of the electron energy gain, yet fails to generate an energetic component. We suggest that this is due to the weak energy scaling of particle acceleration from $E_\parallel$ compared to that of a Fermi-type mechanism responsible for energetic electron production in the weak guide-field regime. This result has important implications for energetic electron production in astrophysical systems and reconnection-driven dissipation in turbulence.
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The Mechanism of Electron Injection and Acceleration in Trans-Relativistic Reconnection
In trans-relativistic reconnection simulations, the out-of-plane component of the parallel electric field at X-points is what injects electrons into the nonthermal tail, and more X-points per unit length produce harde...
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