Specific features of the ionospheric structure over Western Europe observed during a period of strong heliogeophysical disturbances in the fall, 2003, are considered. A region of enhanced ionization in the nighttime ionosphere on 30/31 October is imaged by four-dimensional tomography based on high-orbiting satellite data. Motion of the spot of enhanced ionization approximately along geomagnetic latitude is traced. Radio tomographic results are compared with the data from a series of digisondes.
Department of Physics of Atmosphere, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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