volume 25, issue 11, P1765-1768 1998
DOI: 10.1029/98gl01086
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Abstract: Abstract. We report three new findings from the first observations of quasi-periodic (QP) radar echoes at 24.5-MHz. Most interesting is that QP echoes produced by 6.1-m fieldaligned irregularities (FAI) can occur at altitudes as high as 150 km. Because Hall currents are negligible there, the existence of these FAI require interpretation at least in terms of a generalized gradient-drift instability that allows for (1) a transition from a Hall current at low altitudes to a Pedersen current at high altitudes, an…

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