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Magnetic reconnection plays an important role in the release of magneticenergy and consequent energization of particles in collisionless plasmas.Energy transfer in collisionless magnetic reconnection is inherently a two-stepprocess: reversible, collisionless energization of particles by the electricfield, followed by collisional thermalization of that energy, leading toirreversible plasma heating. Gyrokinetic numerical simulations are used toexplore the first step of electron energization, and we generate the firstexamples of field-particle correlation (FPC) signatures of electronenergization in 2D strong-guide-field collisionless magnetic reconnection. Wedetermine these velocity space signatures at the x-point and in the exhaust,the regions of the reconnection geometry in which the electron energizationprimarily occurs. Modeling of these velocity-space signatures shows that, inthe strong-guide-field limit, the energization of electrons occurs through bulkacceleration of the out-of-plane electron flow by parallel electric field thatdrives the reconnection, a non-resonant mechanism of energization. We explorethe variation of these velocity-space signatures over the plasma beta range$0.01 \le \beta_i \le 1$. Our analysis goes beyond the fluid picture of theplasma dynamics and exploits the kinetic features of electron energization inthe exhaust region to propose a single-point diagnostic which can potentiallyidentify a reconnection exhaust region using spacecraft observations.

Characterizing Velocity-Space Signatures of Electron Energization in Large-Guide-Field Collisionless Magnetic Reconnection