COST Action ES0803
Open Access

Fig. 6.


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Left panel: solar activity variation (F10.7) from 1995 to 2009 covering solar cycle 23 (1996–2008). Right panel: location of three test sites at which TEC is extracted from regularly produced GNSS-based TEC maps over Europe (Jakowski 1996; Jakowski et al. 2011).

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