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• W2037597071 endingPage "3630" @default.
• W2037597071 startingPage "3615" @default.
• W2037597071 abstract "A series of experiments with the Sondrestrom incoherent scatter (IS) radar (66.99°N latitude, 50.95°W longitude) were designed to examine F region structure in the dayside auroral oval in order to search for plasma signatures from magnetospheric regions such as the cusp, boundary plasma sheet, low‐latitude boundary layer, and mantle. This IS radar mode, optimized to search for ionospheric features which remain fixed in local time, was coordinated with overflights of the DMSP F‐10 satellite on 2 days in September 1992. For both study days, IS radar data show persistent (∼ 7 hour), enhanced T e regions at 300 to 500 km. These enhanced T e regions evolve during periods in which relatively unstructured, laminar N e densities are observed and thus are not merely the result of a structured suppression of electron cooling. The cores of these T e enhancements were observed at latitudes and magnetic local times corresponding to DMSP satellite measurement of soft (< 100 eV) cusplike precipitation. These T e hotspots move systematically equatorward with increasing geomagnetic activity and display a sharp field‐aligned equatorward edge at the location of satellite cusp detection. Unlike prior IS radar/satellite cusp investigations, no significant N e enhancements were measured coincident with T e hotspots. A simple ionospheric model is invoked to confirm that such soft cusplike precipitation does not significantly alter the magnitude of the ambient plasma density, and we argue that cusp detection based on collocated N e and T e enhancements is seldom possible. The local time persistence of the T e enhancements, beyond the typical cusp widths, suggests an association with additional dayside magnetospheric regimes such as the low‐latitude boundary layer. Both latitudinal and vertical T e gradients maximize at the location of satellite cusp detection, suggesting that the heat source is a divergence of magnetospheric heat flux on freshly reconnected geomagnetic field lines." @default.
• W2037597071 created "2016-06-24" @default.
• W2037597071 creator A5050538180 @default.
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• W2037597071 date "2001-03-01" @default.
• W2037597071 modified "2023-09-27" @default.
• W2037597071 title "Observations of persistent dayside<i>F</i>region electron temperature enhancements associated with soft magnetosheathlike precipitation" @default.
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• W2037597071 doi "https://doi.org/10.1029/2000ja000186" @default.
• W2037597071 hasPublicationYear "2001" @default.
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