1Finnish Meteorological Institute, Helsinki, Finland
2Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland
3Department of Mathematics, Tallinn University of Technology, Tallinn, Estonia
4Eigenor Corporation, Sodankylä, Finland
Received: 16 Nov 2015 – Discussion started: 04 Dec 2015
Abstract. Sodankylä Geophysical Observatory has been operating a receiver network for ionospheric tomography and collecting the produced data since 2003. The collected data set consists of phase difference curves measured from COSMOS navigation satellites from the Russian Parus network (Wood and Perry, 1980) and tomographic electron density reconstructions obtained from these measurements. In this study vertical total electron content (VTEC) values are integrated from the reconstructed electron densities to make a qualitative and quantitative analysis to validate the long-term performance of the tomographic system. During the observation period, 2003–2014, there were three to five operational stations at the Fennoscandia sector. Altogether the analysis consists of around 66 000 overflights, but to ensure the quality of the reconstructions, the examination is limited to cases with descending (north to south) overflights and maximum elevation over 60°. These constraints limit the number of overflights to around 10 000. Based on this data set, one solar cycle of ionospheric VTEC estimates is constructed. The measurements 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 data very well, but the IRI-2012 model results are on average 40 % higher than that of the tomographic results.
Revised: 15 Apr 2016 – Accepted: 02 May 2016 – Published: 01 Jul 2016
Norberg, J., Roininen, L., Kero, A., Raita, T., Ulich, T., Markkanen, M., Juusola, L., and Kauristie, K.: Sodankylä ionospheric tomography data set 2003–2014, Geosci. Instrum. Method. Data Syst., 5, 263-270, doi:10.5194/gi-5-263-2016, 2016.