F-region drift velocities in the dusk sector mid-latitude trough |
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| Institution: | 1. Pakistan Space and Upper Atmosphere Research Commissions (SUPARCO), Karachi, Pakistan;2. Theoretical Research Institute, Pakistan Academy of Sciences (TRIPAS), Islamabad, Pakistan;1. Institute of Geophysics, Vietnam Academy of Science and Technology, A8, 18 Hoang Quoc Viet str., CauGiay, Hanoi, Viet Nam;2. Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Viet Nam;3. Sorbonne Universités, UPMC Univ. Paris 06, UMR 7648, Laboratoire de Physique des Plasmas, F-75005 Paris, France;4. T/ICT4D, ICTP, International Centre for Theoretical Physics, Strada Costiera, 11, I - 34151 Trieste Italy;5. Ho Chi Minh City University of Technology and Education, 1 Vo Van Ngan Street, Linh Chieu Ward, Thu Duc District, Ho Chi Minh City, Viet Nam;6. National Institute of Information and Communications Technology, 4-2-1 Nukui-kita, Koganei, Tokyo 184-8795, Japan;1. College of Geomatics, Xi’an University of Science and Technology, Xi’an 710054, China;2. Beijing Key Laboratory of Urban Spatial Information Engineering, Beijing 100045, China;3. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;4. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China;1. Instituto Tecnológico de Aeronáutica (ITA), Brazil;2. Instituto Nacional de Pesquisas Espaciais (INPE), Brazil;3. Instituto de Aeronáutica e Espaço (IAE), Brazil;4. Instituto Federal de Educação, Ciência e Tecnologia de São Paulo (IFSP-PEP), Brazil |
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| Abstract: | Analysis of 6 months of ground-based ionosonde data from mid/high-latitude Digisonde stations at Millstone Hill, Argentina and Goose Bay, shows the relation between the formation of the mid-latitude trough in the dusk sector and the measured F-region drift velocities. The observed westward drift velocities in the trough are comparable in magnitude with the velocity of the Earth's rotation as required by the stagnation theory of trough formation. Using the Digisonde database of 15 min samples of electron density profiles and F-region drifts, a new trough detection algorithm automatically identifies the occurrence of the trough at any of the three stations. Correlating trough occurrence with the measured drift velocities indicates that troughs develop due to an increase in the horizontal westward velocity component. The extent of the trough formation relates to the magnitude of the horizontal velocity. |
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