Instability of the state of the night-time topside ionosphere |
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| Institution: | 1. Department of Medical Biophysics, University of Toronto, Canada;2. Physical Sciences, Sunnybrook Research Institute, Toronto, Canada;1. Center of Engineering and Exact Sciences, Western Paraná State University, Av. Tarquínio Joslin dos Santos, 1300, Foz do Iguaçu 85870-650, PR, Brazil;2. Department of Electrical and Computer Engineering, São Carlos School of Engineering, University of São Paulo, Av. Trabalhador São-Carlense, 400, São Carlos 13566-590, SP, Brazil;1. Computational Space Physics Group, Lab for Computing and Applied Math (LABAC), National Institute for Space Research (INPE), Av. dos Astronautas, 1758, São José dos Campos, São Paulo 12227-690, Brazil;2. Aeronomy Division, National Institute for Space Research (INPE), Av. dos Astronautas, 1758, São José dos Campos, São Paulo 12227-690, Brazil;3. School of Physics and Mathematics, Autonomous University of Nuevo León (UANL), Av. Universidad s/n, Cd. Universitaria, San Nicolás de los Garza N.L. 66455, Mexico |
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| Abstract: | It is common knowledge that the night-time ionosphere at the middle and moderately high latitudes is sustained by the charged particle flux arriving from plasmasphere along magnetic field lines. The downward directed particle velocity in this flux decreases with the decreasing height. It provides a potential source for plasma instability. This should be interpreted in such a way that the initial density perturbations increase with the time, and are enhanced as they propagate in space. In this paper we have carried out investigations of topside ionosphere plasma stability on the basis of solving the dispersion equation for low-frequency waves in a weakly inhomogeneous medium. Also analysis have been made of propagation of the waves within ray approximation. Is shown, that of irregularities, extending down accrue on intensity up to heights of a maximum of layer F2, and are loss in low layers of ionosphere. |
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