Dynamical coupling of the auroral F-region ionosphere and thermosphere: case studies |
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| Affiliation: | 1. CESR-CNRS-UPS, 9 Avenue Colonel Roche, 31029 Toulouse Cedex, France;2. CRPE-CNRS-CNET, 4 Avenue de Neptune, 94400 St. Maurs-les-Fosses, France;1. Indian Institute of Geomagnetism, Mumbai, 410218, India;2. School of Environmental Science, Jawaharlal Nehru University, New Delhi, 110067, India;3. Johns Hopkins University Applied Physics Laboratory, Laurel, 20723, United States;1. Division of Allergy and Immunology, Boston Children’s Hospital, Boston, Mass;2. Division of Pulmonary Medicine, Boston Children’s Hospital, Boston, Mass;3. Institutional Centers for Clinical and Translational Research, Boston, Mass;4. Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Mass;5. Department of Pediatrics, Harvard Medical School, Boston, Mass |
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| Abstract: | During two 24 h periods of EISCAT observations in the summer of 1982, the F-region ion temperature and density responded differently before and after midnight to large ion convective flows. Such observations were recently reported at Chatanika (Alaska), however, the mechanism invoked to interpret these measurements (large day-to-night variation in electron density affecting the coupling between ions and neutrals) appears insufficient, for summer conditions, to account for the EISCAT observations. Hence, it is proposed, with the support of Fabry-Perot observations and numerical models, that in addition to the electron density asymmetry, the presence of a large southward neutral wind around midnight induces, through Coriolis coupling, a zonal neutral wind of an opposite direction to the convective flow. This enhances considerably the frictional energy and momentum transfer between ions and neutrals in the post-midnight sector. |
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