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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Seasonal variation of inter-hemispheric field-aligned currents deduced from time-series analysis of the equatorial geomagnetic field data during solar cycle 23–24

Fig. 3

Solar cycle dependence of ∆D variations. a Illustration of the derivation method of peak-to-peak amplitude and integral intensity of ∆D variations; b monthly average of ∆D variations plotted by the separated groups in terms of solar cycle activity: the ascending-maximum phase (1998–2003, 2011–2015) as shown with solid lines and declining-minimum phase (2004–2010, 2016–2019) as indicated by dashed lines, the error bar shows standard deviations for each data point. c Peak-to-peak amplitude of yearly ∆D variations; d yearly integral intensity of ∆D variations, which is provided by the summation of hatched areas in panel (a). Through (b–d), the blue, red and green colors represent the dawn, noon and dusk sectors, respectively. The data points for 2008, 2009, and 2014 were removed due to the lack of data per year

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