In the paper results of analysis of the influence of ionospheric storm on positioning precision are presented. The analysis rely on studying of repeatability of vectors` coordinates. Different vector lengths (250 km-1300km) were studied. These vectors were investigated during the ionospheric storms.The permanent observations from IGS/EUREFstations were analysed. Those stations connect Borowiec, Borowa Góra, Lamkowo, Onsala, Mendeleevo, Kotwijk, Matera and Metsahovi. Their latitudes range from 41(st.)N to 60 (st.)N. Software Bernese ver. 4.0 was used for the analysis of observational data of the six and twelve-hours sessions. Results were refered to those otained from 24-hours sessions.
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