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Kinetic particle‐in‐cell simulations are used to identify signatures of the electron diffusion region (EDR) and its surroundings during asymmetric magnetic reconnection. A “shoulder” in the sunward pointing normal electric field ( E N   > 0) at the reconnection magnetic field reversal is a good indicator of the EDR and is caused by magnetosheath electron meandering orbits in the vicinity of the  X  line. Earthward of the  X  line, electrons accelerated by  E N   form strong currents and crescent‐shaped distribution functions in the plane perpendicular to  B . Just downstream of the  X  line, parallel electric fields create field‐aligned crescent electron distribution functions. In the immediate upstream magnetosheath, magnetic field strength, plasma density, and perpendicular electron temperatures are lower than the asymptotic state. In the magnetosphere inflow region, magnetosheath ions intrude resulting in an Earthward pointing electric field and parallel heating of magnetospheric particles. Many of the above properties persist with a guide field of at least unity.

Kinetic signatures of the region surrounding the X line in asymmetric (magnetopause) reconnection