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We present riometer and in situ observations of a substorm electroninjection on 27 August 2001. The event is seen at more than 20 separatelocations (including ground stations and 6 satellites: Cluster, Polar,Chandra, and 3 Los Alamos National Laboratory (LANL) spacecraft). Theinjection is observed to be dispersionless at 12 of these locations.Combining these observations with information from the GOES-8 geosynchronoussatellite we argue that the injection initiated near geosynchronous orbitand expanded poleward (tailward) and equatorward (earthward) afterward.Further, the injection began several minutes after the reconnectionidentified in the Cluster data, thus providing concrete evidence that, in atleast some events, near-Earth reconnection has little if any ionosphericsignature

Global observations of substorm injection region evolution: 27 August 2001