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Sodankylä Geophysical Observatory has been operating a receiver networkfor ionospheric tomography and collecting the produced data since 2003. Thecollected data set consists of phase difference curves measured from COSMOSnavigation satellites from the Russian Parus network (Wood and Perry, 1980)and tomographic electron density reconstructions obtained from thesemeasurements. In this study vertical total electron content (VTEC) values areintegrated from the reconstructed electron densities to make a qualitativeand quantitative analysis to validate the long-term performance of thetomographic system. During the observation period, 2003–2014, there werethree to five operational stations at the Fennoscandia sector. Altogether theanalysis consists of around 66 000 overflights, but to ensure the quality ofthe reconstructions, the examination is limited to cases with descending(north to south) overflights and maximum elevation over 60°. Theseconstraints limit the number of overflights to around 10 000. Based on thisdata set, one solar cycle of ionospheric VTEC estimates is constructed. Themeasurements are compared against the International Reference Ionosphere(IRI)-2012 model, F10.7 solar flux index and sunspot number data.Qualitatively the tomographic VTEC estimate corresponds to reference datavery well, but the IRI-2012 model results are on average 40 % higher thanthat of the tomographic results

Sodankylä ionospheric tomography data set 2003–2014