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We investigate an unusual sharp boundary separating two plasma populations\ud(inner magnetospheric plasma with high fluxes of energetic particles and\udplasma sheet) observed by the Cluster quartet near its perigee on 16 December 2003.\udCluster was in a pearl-on-string configuration at 05:00 MLT and mapped along\udmagnetic field lines to ~8–9 RE in the equatorial plane. It was\udconjugate to the MIRACLE network and the DMSP F16 spacecraft passed close to\udCluster footpoint. The properties of the sharp boundary, repeatedly crossed 7\udtimes by five spacecraft during ~10 min, are: (1) upward FAC sheet\udat the boundary with ~30 nA/m2 current density at Cluster and\ud~2000 nA/m2 at DMSP; (2) the boundary had an embedded layered\udstructure with different thickness scales, the electron population transition\udwas at ~20 km scale at Cluster (<7 km at DMSP), proton population had\uda scale ~100 km, while the FAC sheet thickness was estimated to be\ud~500 km at Cluster (~100 km at DMSP); (3) the boundary propagated\udin the earthward-eastward direction at ~8 km/s in situ\ud(equatorward-eastward ~0.8 km/s in ionosphere), and then decelerated\udand/or stopped. We discuss the boundary formation by the collision of two\uddifferent plasmas which may include dynamical three-dimensional field-aligned\udcurrent loops

Conjugate observation of sharp dynamical boundary in the inner magnetosphere by Cluster and DMSP spacecraft and ground network