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Detailed Reference Information |
Balthazor, R.L. and Moffett, R.J. (1999). Morphology of large-scale traveling atmospheric disturbances in the polar thermosphere. Journal of Geophysical Research 104: doi: 10.1029/1998JA900039. issn: 0148-0227. |
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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. ¿ 1999 American Geophysical Union |
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Abstract |
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Keywords
Meteorology and Atmospheric Dynamics, Waves and tides, Atmospheric Composition and Structure, Thermosphere—energy deposition, Ionosphere, Current systems, Magnetospheric Physics, MHD waves and instabilities |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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