On March 16, 1972, high spatial resolution VHF backscatter measurements of evening diffuse radar aurora were obtained at the NOAA radar site near Anchorage, Alaska. These measurements indicate that the region of radar aurora has considerable time-varying and latitudinal structure. Comparison of the dynamics of this region with concurrent magnetograms indicates that the irregularities are spatially coincident with the evening eastward auroral electrojet and indeed appear to be generated by the electrojet current flow. Additional comparison of the radar data with all-sky camera photographs indicates that the diffuse radar auroral irregularities and hence the eastward auroral electrojet occur in a latitudinal zone that is equatorward and adjacent to the region of visual auroral activity. Finally, discrete radar auroral echoes, which were observed in the premidnight hours, were located on the poleward edge of the visible aurora and appeared after westward traveling spirals or surges passed through the radar beam.
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Greenwald et al. (1973) studied this question.
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