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• W4256365839 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> A common feature of evening near-range ionospheric backscatter in the CUTLASS Iceland radar field of view is two parallel, approximately <i>L</i>-shell-aligned regions of westward flow which are attributed to irregularities in the auroral eastward electrojet region of the ionosphere. These backscatter channels are separated by approximately 100–200 km in range. The orientation of the CUTLASS Iceland radar beams and the zonally aligned nature of the flow allows an approximate determination of flow angle to be made without the necessity of bistatic measurements. The two flow channels have different azimuthal variations in flow velocity and spectral width. The nearer of the two regions has two distinct spectral signatures. The eastern beams detect spectra with velocities which saturate at or near the ion-acoustic speed, and have low spectral widths (less than 100 m s^–1), while the western beams detect lower velocities and higher spectral widths (above 200 m s^–1). The more distant of the two channels has only one spectral signature with velocities above the ion-acoustic speed and high spectral widths. The spectral characteristics of the backscatter are consistent with E-region scatter in the nearer channel and upper-E-region or F-region scatter in the further channel. Temporal variations in the characteristics of both channels support current theories of E-region turbulent heating and previous observations of velocity-dependent backscatter cross-section. In future, observations of this nature will provide a powerful tool for the investigation of simultaneous E- and F-region irregularity generation under similar (nearly co-located or magnetically conjugate) electric field conditions.<br><br><b>Key words.</b> Auroral ionosphere · Ionospheric irregularities · Plasma convection" @default.
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• W4256365839 date "1997-01-01" @default.
• W4256365839 modified "2023-09-24" @default.
• W4256365839 title "Simultaneous observations at different altitudes of ionospheric backscatter in the eastward electrojet" @default.
• W4256365839 doi "https://doi.org/10.1007/s005850050579" @default.
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