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Earth, Planets and Space
Fig. 12 | Earth, Planets and Space

Fig. 12

From: On some features characterizing the plasmasphere–magnetosphere–ionosphere system during the geomagnetic storm of 27 May 2017

Fig. 12

The ratio tTEC/bTEC (in blue) as calculated at SODA (67.4°N, 26.4°E), JOEN (62.4°N, 30.1°E), and RIGA (56.9°N, 24.1°E), from 26 May to 2 June 2017, in UT. SODA, JOEN and RIGA are the closest GNSS receivers to the pairs of magnetometers MUO–RAN, RAN–HAN and TAR–BRZ of the EMMA array, respectively, used to describe the latitudinal dependence of the plasmasphere dynamics as shown in Fig. 7. Corresponding 2 h and half running means to which the mean value of 26 May 2017, considered as the quiet time reference, has been subtracted, are also displayed in red. In the right panels, the daily standard deviations related to the red curves, from 28 May to 2 June 2017, are plotted and fitted through an exponential function y = A·e(−t/τ), where τ is a characteristic time typifying the recovery phase of the ionospheric plasma

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