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During the 6th August 1995, the\udCUTLASS Finland HF radar ran in a high time resolution mode, allowing\udmeasurements of line-of-sight convection velocities along a single beam with a\udtemporal resolution of 14 s. Data from such scans, during the substorm expansion\udphase, revealed pulses of equatorward flow exceeding ~600 m s–1 with\uda duration of ~5 min and a repetition period of ~8 min. Each pulse of enhanced\udequatorward flow was preceded by an interval of suppressed flow and enhanced\udionospheric Hall conductance. These transient features, which propagate\udeastwards away from local midnight, have been interpreted as ionospheric current\udvortices associated with field-aligned current pairs. The present study reveals\udthat these ionospheric convection features appear to have an accompanying\udsignature in the magnetosphere, comprising a dawnward perturbation and\uddipolarisation of the magnetic field and dawnward plasma flow, measured in the\udgeomagnetic tail by the Geotail spacecraft, located at L = 10 and\udsome four hours to the east, in the postmidnight sector. These signatures are\udsuggested to be the consequence of the observation of the same field aligned\udcurrents in the magnetosphere. Their possible relationship with bursty Earthward\udplasma flow and magnetotail reconnection is discussed. Key words. Ionosphere (Auroral · ionosphere) ·\udMagnetospheric Physics (Magnetotail; Storms and substorms

Simultaneous ionospheric and magnetospheric observations of azimuthally propagating transient features during substorms