The variability of ionospheric dynamo currents |
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| Affiliation: | 1. Department of Physics, Busitema University, Tororo, Uganda;2. Department of Physics, Mbarara University of Science and Technology, Mbarara, Uganda;3. Department of Physics, Makerere University, Kampala, Uganda;1. Samara University, Department of Physics, Samara, Ethiopia;2. Washera Geospace and Radar Science Laboratory, Bahir Dar University, Bahir Dar, Ethiopia;1. Department of Space Science and Application, Entoto Observatory and Research Center, Ethiopian Space Science and Technology Institute, Addis Ababa, Ethiopia;2. Washera Geospace and Radar Science Laboratory, Physics Department, Bahir Dar University, Bahir Dar, Ethiopia;3. Climate and Space Sciences and Engineering, University of Michigan, USA;1. Charles University, Faculty of Mathematics and Physics, Department of Geophysics, Prague, Czech Republic;2. Dublin Institute for Advanced Studies, School of Cosmic Physics, Geophysics Section, Dublin, Ireland;1. Space Science and Application Research Development Department, Entoto Observatory and Research Center (EORC), Ethiopian Space Science and Technology Institute (ESSTI), Addis Ababa, Ethiopia;2. Washera Geospace and Radar Science Laboratory, Physics Department, Bahir Dar University, Bahir Dar, Ethiopia;3. Climate and Space Sciences and Engineering, University of Michigan, USA;1. Physical Research Laboratory, Ahmedabad, 380009, India;2. Universidade Federal de Campina Grande (UFCG), Campina Grande, Brazil;3. National Atmospheric Research Laboratory, Gadanki, 517112, India;4. Regional Remote Sensing Center (RRSC), Nagpur, India;5. Indian Institute of Geomagnetism, Navi Mumbai, 410218, India;6. Department of Physics, Andhra University, Visakhapatnam, 530003, India;7. Instituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, Brazil |
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| Abstract: | The method of Hibberd is used to study the variability of ionospheric dynamo currents from day to day, with solar rotation and with the solar cycle. The method eliminates many sources of disturbance by using the difference of H at two magnetic observatories having the same longitude but different latitudes. In this way, a measure of the strength of the ionospheric currents can be obtained almost every day, even during magnetically disturbed periods. It is concluded that the currents are produced partly by tidal modes driven by in situ heating in the thermosphere, and that variations in the amplitude of these modes are mainly responsible for the solar rotation and the solar cycle effects which are observed. There are also random day-to-day changes, uncorrelated from one day to the next, and these suggest that upward propagating tidal modes are also important in driving the currents. |
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