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- W1990658664 abstract "A modeling study of the atmospheric response to a single short burst of enhanced ion convection at high latitudes, undertaken using the Sheffield/University College London/Space Environment Laboratory coupled ionosphere/thermosphere model, has revealed a large‐scale atmospheric gravity wave (AGW) moving equatorward from a source in the dawn sector auroral zone. The wave propagates to midlatitudes, perturbing the ionosphere and creating a traveling ionospheric disturbance. Analysis of the interaction between the thermosphere and ionosphere during the passage of the AGW at midlatitudes is undertaken and reveals a complex height‐dependent response. At lower altitudes the field‐aligned velocity of the ions follows closely the field‐aligned wind. Above the F peak, diffusion processes become important and the field‐aligned ion velocity shows fluctuations which exceed those in the wind. Changes in N m F 2 and h m F 2 , during the interaction, are due to redistribution of plasma alone with changes in production and loss insignificant. As the F layer is lifted by the positive surge in the gravity wave, N m F 2 decreases, due to a divergence in the ion flux, itself caused by the combination of a divergent neutral wind and an increase in the effects of diffusion with altitude. The slab thickness also increases. Subsequently, the opposite happens as h m F 2 falls below its equilibrium value." @default.
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- W1990658664 date "1993-11-01" @default.
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- W1990658664 title "Effects of an atmospheric gravity wave on the midlatitude ionospheric <i>F</i> layer" @default.
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- W1990658664 doi "https://doi.org/10.1029/93ja02093" @default.
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