Fig. 1From: Seasonal variation of inter-hemispheric field-aligned currents deduced from time-series analysis of the equatorial geomagnetic field data during solar cycle 23–24Daily ∆D variations at Davao as a function of local time and day of year. a 2010, b 2013, c 2015, d 2016. The color bar shows the intensity of ∆D. The red (= eastward ∆D) and blue (= westward ∆D) colors correspond to the southward IHFACs and the northward IHFACs, respectivelyBack to article page