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- W2019014959 abstract "Optical emissions and electron flow patterns in the auroral oval evening sector have been investigated in the 30-min interval prior to a major auroral intensification. The STARE radar and Viking UV image data were combined to give a dynamical picture of the auroral ionosphere just to the west of the intensification region which was bordered on its eastward side by the foot of a high-latitude polar arc. Half an hour prior to the main intensification an auroral arc appeared equatorward of a band of eastward electrojet, which in turn was equatorward of another discrete arc system. The appearance of the new arc system was accompanied by a second eastward electrojet further equatorward. Within minutes of this appearance the older electrojet and arc system faded and the new system moved poleward to replace it. This precursor activity was followed by a major intensification, a substorm, to the east of the foot of the high-latitude polar arc. It is speculated that the precursor is linked to changes in the current distribution in the near-Earth nightside magnetosphere prior to the substorm onset." @default.
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- W2019014959 date "1993-04-01" @default.
- W2019014959 modified "2023-09-24" @default.
- W2019014959 title "Oval intensification event observed by STARE and Viking" @default.
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- W2019014959 doi "https://doi.org/10.1029/92ja00901" @default.
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