On the gravity wave-driven instability of E layer at mid-latitude |
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| Authors: | S. Shalimov T. Ogawa Y. Otsuka |
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| Affiliation: | 1. Institute of Physics of the Earth, Moscow, Russia;2. Space Research Institute, Moscow, Russia;3. Solar-Terrestrial Environment Laboratory, Nagoya University, Japan;1. University of Warmia and Mazury in Olsztyn, Geodynamics Research Laboratory (GRL/UWM), Olsztyn, Poland;2. West Department of Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Kaliningrad, Russia;1. Department of Electrical Engineering, The Pennsylvania State University, University Park, PA, USA;2. Department of Physics, The Pennsylvania State University-Lehigh Valley, Center Valley, PA, USA;1. Department of Physics, Mbarara University of Science and Technology, Mbarara, Uganda;2. Department of Physics, Busitema University, Tororo, Uganda;3. South African National Space Agency (SANSA) Space Science, P.O. Box 32, Hermanus 7200, South Africa;1. Institute of Solar-Terrestrial Physics of Siberian Branch of Russian Academy of Sciences, Irkutsk, Russia;2. Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia;3. Institute of Cosmophysical Research and Aeronomy of Siberian Branch of Russian Academy of Sciences, Yakutsk, Russia;4. Institute of Cosmophysical Researches and Radio Wave Propagation of the Far Eastern Branch of Russian Academy of Science, Paratunka, Russia;5. Institute of Geophysics of the Ural Branch of Russian Academy of Science, Ekaterinburg, Russia;6. Pushkov Institute of Terrestrial Magnetism Ionosphere and Radio Wave Propagation of Russian Academy of Science, Moscow, Russia;7. West Department of Pushkov Institute of Terrestrial Magnetism Ionosphere and Radio Wave Propagation of Russian Academy of Science, Kaliningrad, Russia;8. Leibniz Institute for Atmospheric Physics, Kühlungsborn, Germany |
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| Abstract: | The plasma instability process during internal gravity wave propagation through the ionospheric E region is considered. The growth rate of the instability has been found and it has been shown that it depends on perturbation wavelength, gravity wave parameters and direction of propagation. The conditions for the instability are favorable when the vorticity of the associated neutral motion becomes antiparallel to the geomagnetic field. In the proposed instability mechanism plasma irregularities could seed the large-scale sporadic E layer structuring because they are generated in situ as a part of the same neutral wind structure that serves to initiate the formation of the layer. |
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