Abstract
Using a fully coupled thermosphere‐ionosphere‐plasmasphere model, we investigate the morphology of modelled Large‐Scale Traveling Atmospheric Disturbances (LS‐TADs, hereinafter TADs) propagating both poleward and equatorward from auroral sources. We confirm observational evidence of daytime ion‐drag, reducing equatorward far‐field TAD activity. We further suggest an additional source‐dependent mechanism that associates TADs propagating preferentially poleward with an auroral electric field burst that contains an eastward rather than a westward component. These poleward TADs are superimposed on the high‐speed neutral air winds in the polar cap (originating from the day‐night plasma convection) and exhibit speed and spatial resonance effects with the neutral wind. The direction of propagation is affected by Coriolis forcing due to the Earth's rotation.
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