The evolution of north-south aligned auroral forms into auroral torch structures: The generation of omega bands and Ps6 pulsations via flow bursts

Physics

Scientific paper

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2704 Auroral Phenomena (2407), 2744 Magnetotail, 2788 Storms And Substorms

Scientific paper

Although auroral torch structures and omega bands have been observed and studied for decades, a satisfactory understanding of how they form has yet to be achieved. Using global auroral imager data, we show conclusively that the equatorward moving north-south (NS) aligned auroral forms that are ejected episodically from the poleward boundary can evolve directly into torch structures which contribute to a well-defined omega-band form. And that as a consequence, omega bands can be produced as a direct result of earthward-directed bursty bulk flows (BBFs).

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