Observations of a day-time mid-latitude ionospheric trough |
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| Affiliation: | 1. Instituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, SP, Brazil;2. Instituto Tecnológico de Aeronáutica (ITA), Divisão de Ciências Fundamentais, São José dos Campos, SP, Brazil;3. Centro de Rádio Astronomia e Astrofísica Mackenzie, Universidade Presbiteriana Mackenzie, SP, Brazil;4. Physical Research Laboratory, Navrangpura, Ahmedabad, 380009, India;5. Universidade do Vale do Paraíba (UNIVAP), Laboratório de Física e Astronomia, São José dos Campos, SP, Brazil;6. Laboratório de Astronomia e Física Espacial (LAFEJ), Universidade Federal de Jataí (UFJ), Goiás, Brazil;7. Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata (UNLP), La Plata, Argentina;1. Discipline of Astronomy, Astrophysics and Space Engineering, IIT Indore, Simrol, Indore 453552, Madhya Pradesh, India;2. Space Applications Centre, Indian Space Research Organization, Ahmedabad 380015, Gujarat, India;3. Institute of Radio Physics and Electronics, University of Calcutta, Kolkata 700009, West Bengal, India;1. Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, Shanghai 200241, China;2. CSIRO Land and Water, Canberra 2601, Australia;3. Fenner School of Environment and Society, The Australian National University, Linnaeus Way, Canberra 2601, Australia;4. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China |
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| Abstract: | A summer, dayside, mid-latitude trough detected by a digital ionosonde located at Halley (76°S, 27°W, L = 4.2) is described. The trough is found to be present in the F2-region only and its movements are found to conform to known trough dynamics. The F1-layer shows a greater degree of development within the trough; slant type sporadic E reflections are present underneath the trough minimum. Satellite data from the northern hemisphere show a conjugate trough, with rapid ion flow occurring within it. Possible formation processes for the trough are examined. It is unlikely that depleted nightside plasma could have contributed to the trough. The trough is formed by the effect of enhanced F2 recombination rates combined with a differing solar production term for the plasma associated with the trough minimum and equatorial edge. |
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