The influence of geomagnetic activity on the upper mesosphere lower thermosphere in the auroral zone. II. Horizontal winds |
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| Institution: | 1. Australian Antarctic Division, Kingston, Tasmania 7150, Australia;2. Mawson Institute for Antarctic Research, University of Adelaide, SA 5001, Australia;3. Department of Physics and Mathematical Physics, University of Adelaide, SA 5001, Australia;1. Departamento de Biodiversidad, Ecología y Evolución, Universidad Complutense de Madrid, E-28040 Madrid, Spain;2. Departamento de Ciencias de la Vida, Facultad de Biología, Ciencias Ambientales y Química, Universidad de Alcalá, E-28801, Alcalá de Henares, Madrid, Spain;3. Department of Geography, Humboldt-Universität zu Berlin, Germany;4. Centro Montes y Aserradero de Valsaín. Organismo Autónomo de Parques Nacionales. Ministerio para la Transición Ecológica y el Reto Demográfico, 40109 Valsaín, Segovia, Spain;1. Department of Land Resources Management, China University of Geosciences (CUG), Hubei, Wuhan 430074, China;2. Institute of Geographic Sciences and Natural Resources Research(CAS), Beijing 100101, China;3. Department of Geography, Center for Environmental Sciences and Engineering, University of Connecticut, 215 Glenbrook Rd, Unit 4148, Storrs, CT 06269, USA;1. Senseable City Lab, Department of Urban Studies and Planning, Massachusetts Institute of Technology, Cambridge, MA 02139, United States;2. Geospatial Data Science Lab, Department of Geography, University of Wisconsin, Madison, WI 53703, United States;3. Department of Architecture, Massachusetts Institute of Technology, Cambridge, MA 02139, United States;4. Urban Management Program, PUCPR, Curitiba 80215-910, Brazil;1. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;2. Department of Electrical and Computer Engineering, Stevens Institute of Technology, NJ 07901 USA;1. Department of Molecular and Developmental Medicine, University of Siena, Italy;2. Department of Brain and Behavioral Science, Medical and Genomic Statistics Unit, University of Pavia, Italy;3. NOUS-School of Specialization (PsyD) in Cognitive and Mindfulness-oriented Psychotherapy, AIM-Associazione Italiana per la Mindfulness, Milano, Italy |
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| Abstract: | A spaced antenna partial reflection radar located at Mawson, Antarctica (67°S, 63°E, invariant latitude 70°S), has been used to measure the horizontal wind field in the height range 70–110 km. Three years of data (1985–1987) from the radar have been analysed in order to investigate correlations between geomagnetic activity (determined from the local K-index) and the horizontal wind. Results are analysed using a randomization technique and show that larger winds are measured during geomagnetically active periods in both the raw (or unfiltered) wind values and in the medium-frequency (2–6 h period) and high-frequency (1–3 h period) components. The raw winds tend to be shifted towards the geographic NW to NE quadrant in the early morning hours during high K-times. The observed correlation is seen down to 86 km and shows a seasonal dependence. The mean r.m.s. velocity of the radar scatterers and the angular spread of the return echoes are also found to be correlated with geomagnetic activity. The medium- and high-frequency components of the wind are polarized in the magnetic zonal direction during all seasons of the year. |
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