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Variability of equatorial ionospheric electron density at fixed heights below the F2 peak
Institution:1. Physics Department, University of Ilorin, P.M.B. 1515 Ilorin, Nigeria;2. The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy;3. Laboratoire de Physique de 1’Atmosphére, Université de Cocody, Abidjan, Côte-d Ivoire;1. UTM-GNSS & Geodynamics Research Group, Faculty of Geoinformation and Real Estate, Infocomm Research Alliance, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia;2. National Space Agency (ANGKASA), Ministry of Science, Technology and Innovation, Lot 2233, Jalan Turi, Kampung Sungai Lang, 42700 Banting, Selangor, Malaysia;1. Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, United States;2. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, United States;3. Solar Physics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States;1. Distant Radiocommunication Scientific Research Institute JSC, Moscow 127083, 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, Kaliningrad 236017, Russia
Abstract:A study on variability of the equatorial ionosphere was carried out at fixed heights below the F2 peak for two different levels of solar activity. The study covered height range of 100 km up to the peak of F2 layer using a real height step increase of 10 km. The variability index used is the percentage ratio of standard deviation over the average value for the month. Daytime minimum variability of between 3% and 10% was observed at height range of about 150–210 km during low solar activity and between 2% and 7% at height range of 160–220 km during high solar activity. The nighttime maximum of between 70% and 187% was observed at height range of about 210–250 km during low solar activity and between 42% and 127% at height range of 210–250 km during high solar activity. The height range at which daytime minimum was observed falls within the F1 height of the ionosphere. The result obtained is consistent with previous works carried out in the low latitude locations for American sector.
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