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Fig. 2 | Earth, Planets and Space

Fig. 2

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. 2

Distribution of the dusk-side IHFAC of the Fukushima’s model type from 1999 to 2019. a The occurrence rate of the dusk-side IHFAC of the Fukushima’s model type as a function of month and year. The red color indicates higher occurrence of the dusk-side IHFAC of the Fukushima’s model type, which means the in-phase IHFAC polarity in both noon and dusk sectors. The blue color represents lower occurrence rate, this is equal to higher occurrences of the dusk-side IHFAC, which disagreed with the concept of Fukushima’s model. The hatched areas show the no-data periods. b The illustration of IHFACs polarity. The left side describes the concept of Fukushima’s model for the northern hemisphere in summer. The right side shows the opposite dusk-side IHFAC of the Fukushima’s model type

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