On the relationship between dynamics of the polar thermosphere and morphology of the aurora: Global-scale observations from Dynamics Explorers 1 and 2
Autor: | Paul B. Hays, Nelson W. Spencer, Timothy L. Killeen, Roderick A. Heelis, L. H. Brace, Raymond G. Roble, L. A. Frank, G. R. Carignan, John D. Craven, J. J. Ponthieu |
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Rok vydání: | 1988 |
Předmět: |
Atmospheric Science
Soil Science Aquatic Science Oceanography Spatial distribution Atmospheric sciences F region Latitude Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Physics::Atmospheric and Oceanic Physics Earth-Surface Processes Water Science and Technology Physics Ecology Paleontology Forestry Geophysics Atmosphere of Earth Space and Planetary Science Drag Physics::Space Physics Polar Thermosphere Ionosphere |
Zdroj: | Journal of Geophysical Research. 93:2675 |
ISSN: | 0148-0227 |
DOI: | 10.1029/ja093ia04p02675 |
Popis: | The effect of the neutral-air circulation in the high-latitude F region on the spatial distribution of the aurora is investigated on the basis of simultaneous global-scale auroral images and neutral-wind vectors obtained over the northern polar cap by the DE 1 and DE 2 satellites in December 1981. The results are presented graphically, along with DE 2 data on the composition, ion densities, and cross-track ion drift of the neutral winds and ISEE-3 IMF measurements, and analyzed. It is found that the large-scale features of the neutral circulation follow the substorm-driven expansion and contraction of the auroral oval, and that the drag effect from ions convecting sunward extends to much lower latitudes and has a more complex morphology than that predicted by GCMs. A number of asymmetries in the flow patterns are considered in detail. |
Databáze: | OpenAIRE |
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