  We report in situ observations of an electron diffusion region (EDR) and
adjacent separatrix region. We observe significant magnetic field oscillations
near the lower hybrid frequency which propagate perpendicularly to the
reconnection plane. We also find that the strong electron-scale gradients close
to the EDR exhibit significant oscillations at a similar frequency. Such
oscillations are not expected for a crossing of a steady 2D EDR, and can be
explained by a complex motion of the reconnection plane induced by current
sheet kinking propagating in the out-of-reconnection-plane direction. Thus all
three spatial dimensions have to be taken into account to explain the observed
perturbed EDR crossing.
