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Fig. 2.


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Solar, geomagnetic and local ionospheric activity (Dourbes) measurements during the period 15–21 March 2015: Solar sunspot index, S N (A), local magnetic index K at Dourbes (B), Dst index (C), GPS TEC (D), f o F2 (E), h′F2 (F) and ionospheric slab thickness (G). Instantaneous measurements denoted with dots and the 27-day medians (based on data from 4 to 30 March) plotted with solid (grey) curves. The standard deviation (2σ), centred on the median, is given by vertical (grey) bars.

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