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Modelled global Total Electron Content over the past 24 hours as generated by IONMON (*).

Year (YY): Day (ddd):


The IONMON model (ESA/ESOC Ionosphere Monitoring Facility, v2) uses an analytic function approach to describe ionospheric structures by means of vertical profile functions combined with horizontal surface functions. TEC data derived from dual-frequency GNSS data are processed in combination with observed electron density profiles obtained from radio occultation measurements.
References: J. Feltens (2007) and J. Feltens et al. (2011)