Long-term thermospheric neutral wind observations over the northern polar cap |
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| Institution: | 1. High Altitude Observatory, National Center for Atmospheric Research, P. O. Box 3000, Boulder, CO 80307-3000, USA;2. Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan, Canada S7N 5E2;3. Space Physics Research Laboratory, The University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109-2143, USA;4. RSIS, Goddard Earth Science DISC, NASA Goddard Space Flight Center, Mailstop 610.2, Greenbelt, MD 20771, USA;1. Space & Atmospheric Physics Group, The Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, UK;2. Department of Earth, Planetary and Space Sciences, University of California, 603 Charles E. Young Drive, Los Angeles, California, CA 90095-1567, USA;1. Indian Institute of Geomagnetism, Kalamboli Highway, New Panvel, Navi Mumbai 410218, Maharashtra, India;2. KSK Geomagnetic Research Laboratory, Hanumanganj, Allahabad 221505, India;3. School of Engineering and Physics, The University of South Pacific, Suva, Fiji;4. Aryabhatta Research Institute of Observational Sciences, Nainital, India;5. Atmospheric Research Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221005, India;6. Indian Institute of Tropical Meteorology, Pune, India;1. Leibniz-Institute of Atmospheric Physics at the Rostock University, Kühlungsborn, Germany;2. Space Physics Laboratory, Vikram Sarabhai Space Center, Trivandrum, India;1. Institute of Space Weather, School of Math & Statistics, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. Department of Physics, Royal Military College of Canada, Kingston, Ontario, Canada;3. Purple Mountain Observatory, Chinese Academy of Sciences, 210008 Nanjing, China;4. Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100080, China;5. National Center for Space Weather, China Meteorological Administration, Beijing 100081, China;1. Space and Plasma Physics, School of Electrical Engineering, KTH Royal Institute of Technology, Stockholm, Sweden;2. Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI, USA;3. School of Physics and Astronomy, Queen Mary University of London, London, United Kingdom;1. Instituto Tecnológico de Aeronáutica (ITA), Divisão de Ciências Fundamentais, São José dos Campos, SP, Brazil;2. Instituto Federal de Educação, Ciência e Tecnologia de São Paulo (IFSP), Campus Jacareí, SP, Brazil;3. Universidade do Vale do Paraíba (UNIVAP), Laboratório de Física e Astronomia, São José dos Campos, SP, Brazil;4. Instituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, SP, Brazil;5. Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata (UNLP), La Plata, Argentina;6. National Atmospheric Research Laboratory (NARL), Gadanki, India |
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| Abstract: | We study the solar dependence of the thermospheric dynamics based on more than 20 years Fabry–Perot interferometer O 6300 Å emission observation of polar cap thermospheric wind from three stations: Thule (76.53°N, 68.73°W, MLAT 86N), Eureka (80.06°N, 86.4°W, MLAT 89N), and Resolute (74.72°N, 94.98°W, MLAT 84N) in combination with the National Center for Atmospheric Research Thermosphere Ionosphere Electrodynamics General Circulation Model (NCAR-TIEGCM). All three stations showed a dominant diurnal oscillation in both the meridional and zonal components, which is a manifestation of anti-sunward thermospheric wind in the polar cap. The three-station observations and the TIEGCM simulation exhibit varying degree of correlations between the anti-sunward thermospheric wind and solar F10.7 index. The diurnal oscillation is stronger at Eureka (～150 m/s) than that at Resolute (～100 m/s) according to both observations and TIEGCM simulation. The semidiurnal oscillation is stronger at Resolute (～20 m/s) than that at Eureka based (～10 m/s) on data and model results. These results are consistent with a two-cell convection pattern in the polar cap thermospheric winds. The Thule results are less consistent between the model and observations. The simulated meridional wind diurnal and semidiurnal oscillations are stronger than those observed. |
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