Simultaneous measurements of the thermospheric wind profile at three separate positions in the dusk auroral oval

Computer Science – Sound

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Atmospheric Circulation, Auroras, E Region, F Region, Thermosphere, Wind Measurement, Coriolis Effect, Electron Density (Concentration), Mesosphere, Rocket Sounding, Wave Propagation

Scientific paper

In the present three-dimensional wind field observations in the dusk auroral oval, the F region winds appear to be at the transition from a clockwise vortex centered at dusk to an antisunward flow at the nightside of the polar cap, while the E region winds seem to be part of a gravity wave with a wind amplitude of 125 m/sec. The wave period is found to be close to three hours, on the basis of the ratio of the magnitude of the wind component normal to the direction of wave propagation to the magnitude parallel to the direction of propagation. The observations show that significant energy resides in the divergent motions that are part of the transient response in the E region, at least in this case.

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