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- W2791396145 abstract "Abstract We report evidence of global‐scale auroral oval oscillations in the millihertz range, using global auroral images acquired from the Ultraviolet Imager on board the decommissioned Polar satellite and concurrent solar wind measurements. On the basis of two events (15 January 1999 and 6 January 2000) studied, it is found that (1) quasi‐periodic auroral oval oscillations (~3 mHz) can occur when solar wind speeds are high at northward or southward interplanetary magnetic field turning, (2) the oscillation amplitudes range from a few to more than 10° in latitudes, (3) the oscillation frequency is the same for each event irrespective of local time and without any azimuthal phase shift (i.e., propagation), (4) the auroral oscillations occur in phase within both the dawn and dusk sectors but 180° out of phase between the dawn and dusk sectors, and (5) no micropulsations on the ground match the auroral oscillation periods. While solar wind conditions favor the growth of the Kelvin‐Helmholtz (K‐H) instability on the magnetopause as often suggested, the observed wave characteristics are not consistent with predictions for K‐H waves. The in‐phase and out‐of‐phase features found in the dawn‐dusk auroral oval oscillations suggest that wiggling motions of the magnetotail associated with fast solar winds might be the direct cause of the global‐scale millihertz auroral oval oscillations." @default.
- W2791396145 created "2018-03-29" @default.
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- W2791396145 date "2018-01-01" @default.
- W2791396145 modified "2023-10-16" @default.
- W2791396145 title "Dawn‐Dusk Auroral Oval Oscillations Associated With High‐Speed Solar Wind" @default.
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- W2791396145 doi "https://doi.org/10.1002/2017ja024527" @default.
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