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DETECTING NARROW, FIELD-ALIGNED SPATIAL STRUCTURES IN THE AURORALIONOSPHERE USING THE EISCAT SVALBARD RADAR DUAL ANTENNAS AS ANINTERFEROMETER

In order to provide observations to help decide between competing theories of Anomalous Ion Spectra (AIS) observed at several Incoherent Scattering Radar (ISR) observatories, to explore the possibility of any connection between this phenomenon and visible auroral forms, and to see if enhanced scattering is due to localised scattering structures, we have used the two antennas of the EISCAT Svalbard Radar (ESR) as an interferometer, recording time series separately from each antenna. This offers an opportunity for high time-resolution observations, and also the possibility of detecting scattering structures localised along the baseline between the two antennas within the radar beam.