Unstable plasma irregular structures in the topside ionosphere and spread-F

• Published in: Geomagnetism and Aeronomy Vol. 50; no. 1; pp. 69 - 78
• Main Authors: Gdalevich, G. L., Depueva, A. Kh, Izhovkina, N. I., Ozerov, V. D.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.02.2010; Springer Nature B.V
• Subjects: Earth and Environmental Science; Earth Sciences; Equator; Geophysics; Geophysics/Geodesy; Ionosphere; Magnetic fields; Plasma; Solar physics; AS, South Atlantic; A, Atlantic; Atmospheric Wave; Topside Ionosphere; Acoustic Gravity Wave; Ionospheric Plasma; Plasma Inhomogeneity
• ISSN: 0016-7932; 1555-645X; 0016-7940
• DOI: 10.1134/S0016793210010093

The results of the Cosmos-900 satellite observ ations of plasma density inhomogeneities in the geomagnetic equator region and the longitudinal distributions of the equatorial spread- F , according to the Intercosmos-19 satellite data are presented. It is show n that the dependence of radiosignal propagation in the ionosphere on geophysical parameters is related to development of the electrostatic instability of the inhomo-geneous ionospheric plasma. The longitudinal dependence of the spread- F , can reflect the influence of the energetic sources, located outside the ionospheric layer that scatters a radio pulse, on the ionosphere. The manifestation of the longitudinal effect in the equatorial spread- F , in the Atlantic region can be explained by the influence of the cone instability on the plasma electrodynamics in the South Atlantic geomagnetic anomaly.