Top three panels: temporal variations of the δτ′sn in the northern and southern hemispheres for three distance ranges. The δτ′sns are averaged over the latitude range 20°–35° in the northern and southern hemispheres separately, and averaged over three distance ranges indicated in the top left corner of each panel. They are further binned every 3.5 years and the error bars give the standard deviation of the mean in each binning interval. Bottom panels: 13-month running mean of the monthly sunspot numbers in the northern and southern hemispheres separately as a function of time. The shaded areas between the two curves indicate an excess of sunspot numbers in the northern hemisphere (red) or the southern hemisphere (blue).
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