Direct Measurements of Field-Particle Energy Exchange and Anomalous Effects Associated with Electromagnetic Turbulence in Electron Diffusion Region of Collisionless Magnetic Reconnection

Magnetic reconnection and turbulence are two fundamental cross-scale processes in collisionless plasmas. Whether kinetic-scale electromagnetic (EM) turbulence can drive and support fast collisionless reconnection is an open and controversial question. In this work, we directly estimated the net field-particle energy exchange and anomalous electric fields associated with EM turbulence within the electron diffusion region, where the magnetic field lines were broken and reconnected. The results confirmed that these anomalous electric fields are mainly contributed by anomalous viscosity term. The maximum contribution of anomalous effects can be up to about 20% of the fast reconnection electric field, while that in most events is less than 5%. Furthermore, the locally generated EM turbulence is inclined to support the fast reconnection, while the locally damping EM turbulence could backfire on the fast reconnection.