HF Doppler observations of medium-scale travelling ionospheric disturbances at mid-latitudes |
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| Institution: | 1. Saint-Petersburg State University of Aerospace Instrumentation, 67, Bolshaya Morskaya, Saint-Petersburg 190000, Russia;2. SCiESMEX, LANCE, Instituto de Geofisica, Unidad Michoacan, Universidad Nacional Autonoma de Mexico, Antigua carretera a Patzcuaro 8701, Morelia, Michoacan C.P. 58089, Mexico;3. CONACYT, Instituto de Geofisica, Unidad Michoacan, Universidad Nacional Autonoma de Mexico, Antigua carretera a Patzcuaro 8701, Morelia, Michoacan C.P. 58089, Mexico;1. State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China;2. China-Brazil Joint Laboratory for Space Weather, Chinese Academy of Sciences, São Jose dos Campos, Brazil;3. School of Physics and Electronics Engineering, Hainan Normal University, Haikou 571158, China;1. Dipartimento di Ingegneria, Università degli Studi di Perugia, 06125 Perugia, Italy;2. School of Mathematics, Statistics and Applied Mathematics, National University of Ireland Galway, Galway, Ireland;1. The Boeing Company, Space Environments, 13100 Space Center Blvd., Houston, TX 77059, USA;2. University of Massachusetts at Lowell, Space Science Laboratory, 600 Suffix Street, Lowell, MA 01851, USA;1. Institute of Solar-Terrestrial Physics of Siberian Branch of Russian Academy of Sciences, Irkutsk 664033, Russia;2. West Department of Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, RAS, Kaliningrad 236017, Russia;3. Immanuel Kant Baltic Federal University, Department of Radiophysics and Information Safety, Kaliningrad 236000, Russia;4. Geophysical Center, RAS, 119296 Moscow, Russia;5. Space Research Institute, RAS, 117997 Moscow, Russia |
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| Abstract: | From 1972 to 1975 F-region medium-scale travelling ionospheric disturbances (MSTIDs) were observed at Leicester, U.K. (52°32′N 1°8′W) by means of the HF Doppler technique. Most of the features of the disturbances previously reported in the literature are confirmed, with the exception of the apparent seasonal variation in the propagation direction. The measured wave azimuth rotates clockwise through 360° in 24 h, supporting theoretical predictions concerning the filtering effect of the neutral wind in the northern hemisphere. The most commonly observed direction of wave propagation, however, is displaced from the antiwind direction and is located at an azimuth of 130–140° relative to the wind. A periodic variation of the direction of wave propagation with respect to the anti-wind direction is evident, which may indicate that lower atmospheric winds can have a greater influence on waves at thermospheric heights than previously supposed.A synoptic survey of the data set reveals little correlation between wave occurrence and auroral processes, and it is unlikely that high-latitude sources are responsible for many of the MSTIDs observed at mid-latitudes. |
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