Comparison between IRI-2012 and GPS-TEC observations over the western Black Sea
Data sets
The RINEX data from the IGS and EPN stations ftp://igs.bkg.bund.de/IGS/obs/
The RINEX data from the CORS-TR stations http://212.156.70.42/
IRI-2012 VTEC values https://omniweb.gsfc.nasa.gov/vitmo/iri2012_vitmo.html