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- W2045481878 abstract "We present the results of a series of incoherent‐scatter radar experiments conducted at Sondrestrom, a high‐latitude station (invariant latitude, 73.9°) over the period August 1994 through August 1998. A novel radar mode was employed that allowed simultaneous observation of the structure of thin ion layers along the geomagnetic meridian and of the accompanying ionospheric electric field; however, only layers with peak densities exceeding ∼1 × 10 5 cm −3 could be detected. Layers were observed during 31 out of 85 experiments for a total of 43 distinct events. The overall objective of this investigation was to examine the limits of the current theory of layer formation. Several features are evident in the data: (1) individual layers tend to be “patchy” in both a spatial and a temporal sense; (2) the direction of the ionospheric electric field when layers were observed is consistent with theory, but for northwesterly fields the layers form ∼10 km lower than expected; (3) variation in a layer's altitude along the geomagnetic meridian can often be correlated to corresponding variation in the direction of the electric field; (4) layers tend to appear when the electric field suddenly changes in direction, magnitude, or both and then remain steady; and (5) layers often disappear from the field of view despite the continued existence of a favorable electric field. We suggest that the altitude discrepancy alluded to in item 2 may result from a systematic error in the model for ion‐neutral collision frequency widely employed in studies of thin metallic‐ion layers. We also suggest that horizontal drift of layer structures may play an important role in explaining items 4 and 5, which are otherwise difficult to reconcile with the prevailing theory." @default.
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- W2045481878 date "2001-05-01" @default.
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- W2045481878 title "Simultaneous observations of thin ion layers and the ionospheric electric field over Sondrestrom" @default.
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- W2045481878 doi "https://doi.org/10.1029/2000ja000164" @default.
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