[Ne v] Fabry-Perot observations of the Cygnus Loop

We present the results of [Ne V] lambda 3426 observations in the Cygnus Loo p supernova remnant using the Fabry-Perot spectrophotometer ESOP. The [Ne V ] emission was measured at 64 sites throughout the Loop. Emission was detec ted at 58 of these sites, 48 of the observations have strong signal to nois e ratios and are used in the final analysis. We derive the kinematics of th is [Ne V] gas mostly along the eastern and western rims of the Cygnus Loop. The eastern rim exhibits large variations in brightness and velocity from place to place, which we relate to projection effects in an inhomogeneous m edium. In the western ridge, we observe similar brightness and velocities ( all negative). This suggests that either the emitting medium is homogeneous or that the far-side emission (positive velocities) is fully absorbed by t he molecular cloud interacting with the supernova remnant. We investigate t he non-equilibrium ionization and temperature conditions required to produc e the [Ne V] emission line as well as the filling factor of the [Ne V] gas.