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Fig. 8

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Left panels: Power spectrum of the By-index over the time period 1968–2020 for 2-sector structures (top panel)/4- or irregular sector structures (bottom panel). Middle panels: Autocorrelation function of the geopotential height (Zg(NH)) over the same period in the NH for the 2-sector structures (top panel)/4- or irregular sector structures (bottom panel). Right panels: Autocorrelation function of the geopotential height (Zg(SH)) over the same period in the SH for the 2-sector structures (top panel)/4- or irregular sector structures (bottom panel).

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