Vol. 19, issue 12, article # 14

Afraimovich E.L., Kiryushkin V.V., Perevalova N.P., Mas'kin M.V. Reconstruction of spatial structure of ionospheric perturbation from data measured at a dense GPS network (GEONET). // Atmospheric and oceanic optics. 2006. V. 19. No. 12. P. 967-972.
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We present a method of reconstruction of spatiotemporal structure of ionospheric perturbations, based on construction of instant pattern of distribution of increments of the total electron content (TEC) in the ionosphere, obtained from data measured at the GPS Earth Observation Network (GEONET), which consists of more than 1000 double-frequency GPS receivers located throughout the territory of Japan. Reconstruction of spatial structure of perturbations is performed by constructing a set of TEC increments at ionospheric points for a given moment in time and through approximation of this set with the help of splines on a uniform and stationary grid. This method was tested in reconstructing spatial structure of perturbations, specially modeled for conditions of powerful earthquake near Hokkaido Island on September 25, 2003. The test results showed that this method is capable of reconstructing spatiotemporal structure of ionospheric perturbations and track the dynamics of their variations with high time resolution.