Seismic Traveling Macroscale Irregularities at Ionospheric F2-region on Data of Distance Sounding

The properties of travelling ionospheric macroscale irregularities (their horizontal sizes are 1-4 thousand kms, excesses of a background are 15-30%), formed in F2 layer as a result of strong earthquake in time of heliogeophysical perturbations are explored. The irregularities arise 10-15 h before earthquakes and move horizontally with a transonic speed on distances of a few thousand kms up to round - the-world trajectories focused approximately along an arc of a major circle, transiting above epicenter region. Information of spent examination was caused by spatial-time differences of dynamics of F2-layer of an ionosphere in time of the heliogeophysical disturbances from dynamics of quasi-causative seismic macroscale ionospheric irregularities. The complex analysis of the arrays of critical frequencies of F2-layer of an ionosphere (foF2) of a world network of automatic ground ionospheric stations of vertical sondage was carried out. Also the ionograms of board sondage of space station "Mir" were used for the analysis. Global TEC maps was used to detect the ionospheric irregularities associated with earthquake precursors. Analyses of all these data confirmed a hypothesis about occurrence of macroscale positive ionospheric irregularities in the vicinity of strong earthquakes (M > 5) epicenters also.