Abstract
High resolution cross spectral analysis of CW radar interferometer data is used to examine short-term temporal and spatial variations of VHF 50-MHz radio aurora. At times, extremely localized scatterers with mean transverse size less than 1 km are resolved. In such localized regions plasma irregularities appear to propagate with well defined phase velocities (identified as narrow peaks in Doppler spectra). Other transient scattering events show large variability in Doppler velocity within an extremely localized region (less than a few hundred meters across) and within a short time interval (<1 s). It is suggested that if many such localized sources of scatter are found within the scattering volume of the radar at one time, interference may significantly alter the spectra received at widely spaced interferometric antenna arrays.
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