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Spatial structures in ionospheric electron density revealed in a tomographic image have been identi®ed with auroral forms and related to their sources in precipitating particles observed by DMSP satellites. The observations of plasma enhancements relate to discrete auroral arcs seen in the post-noon sector, identi®ed by both red-and green-line emissions measured by a meridional scanning photometer. The features lie within a very narrow latitudinal band on L-shells where the satellite detectorsdoi:10.1007/s00585-000-0074-2 fatcat:boezdskrifaaxknbstmyjq3dh4