Figure 1 | Scientific Reports

Figure 1

From: Impacts of sunspot number and Geomagnetic aa-index on climate of Wet Zone West Africa during solar cycles 22–24

Figure 1

(a, b) Variations of Geomagnetic aa-index and SSN [September 1950 to December 2016]. The upper panel is the variation of geomagnetic aa-index obtained from the World Data Center of Geomagnetism, Kyoto, Japan spanning from solar cycle number 19 to solar cycle number 24. The lower panel [Magenta curve] is the variation of sunspots from solar cycle 19 to solar cycle 24. Periods of minimum solar magnetic activities correspond with periods of lowest magnitudes of geomagnetic aa-index. The Figure affirmed that sunspot variation was in-phase with geomagnetic aa-index. It was observed that solar cycle 19 was more active than preceding solar cycles, where SSN were 300 and 180 for solar cycles 19 and 20 respectively.

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