All Figures

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1833fig1.eps} \end{figure}$ Figure 1: Top: WPS derived from daily rates of major flares for the northern hemisphere during CR 1720-1732 (cycle 21: 1982 March-1983 February) with angular frequency values $\omega =48$ ( left) and $\omega =6$ ( right). Color coding from yellow to black represents the square root of the power on a linear scale. White contour lines from thin to thick denote confidence levels at 90%, 95% and 99%. Cross-hatched lines mark the COI. The red bar indicates the time range where strong power occurs in the WPS. Horizontal solid and dashed lines are drawn for periods of 23.8 $\pm$ 0.5 days, respectively. Bottom: strips of synoptic magnetic maps for the belt N0 $^\circ$ -N40 $^\circ$ for CR 1720-1726 (1982 March-1982 September). The line-of-sight component of the magnetic field is represented as white/black for positive/negative polarity. Red crosses indicate the positions of flare events $\geq$ 1. White arrows mark the separation between two flare-producing active regions in successive Carrington rotations which correspond to a quasi-period of $\sim$ 24 days.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1833fig2.eps} \end{figure}$ Figure 2: Same as Fig. 1 but for the southern hemisphere during CR 1693-1706 (cycle 21: 1980 March-1981 March). Red and blue bars indicate time ranges where strong and faint power occurs in the WPS, respectively. Strips of synoptic magnetic maps are for the belt S0 $^\circ$ -S40 $^\circ$ for CR 1695-1702 (1980 May-1980 December).
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1833fig3.eps}\end{figure}$ Figure 3: Same as Fig. 1 but for the northern hemisphere during CR 1786-1799 (cycle 22: 1987 February-1988 February). Strips of synoptic magnetic maps are for the belt N0 $^\circ$ -N40 $^\circ$ for CR 1786-1792 (1987 February-1987 August).
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1833fig4.eps} \end{figure}$ Figure 4: Same as Fig. 1 but for the southern hemisphere during CR 1812-1825 (cycle 22: 1989 February-1990 January). Strips of synoptic magnetic maps are for the belt S0 $^\circ$ -S40 $^\circ$ for CR 1817-1823 (1989 June-1989 December).
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1833fig5.eps} \end{figure}$ Figure 5: Same as Fig. 1 but for the southern hemisphere during CR 1836-1848 (cycle 22: 1990 November-1991 October). Strips of synoptic magnetic maps are for the belt S0 $^\circ$ -S40 $^\circ$ for CR 1837-1843 (1990 December-1991 June).
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1833fig2.eps} \end{figure}$	Figure 2: Same as Fig. 1 but for the southern hemisphere during CR 1693-1706 (cycle 21: 1980 March-1981 March). Red and blue bars indicate time ranges where strong and faint power occurs in the WPS, respectively. Strips of synoptic magnetic maps are for the belt S0 $^\circ$ -S40 $^\circ$ for CR 1695-1702 (1980 May-1980 December).
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1833fig3.eps}\end{figure}$	Figure 3: Same as Fig. 1 but for the northern hemisphere during CR 1786-1799 (cycle 22: 1987 February-1988 February). Strips of synoptic magnetic maps are for the belt N0 $^\circ$ -N40 $^\circ$ for CR 1786-1792 (1987 February-1987 August).
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1833fig4.eps} \end{figure}$	Figure 4: Same as Fig. 1 but for the southern hemisphere during CR 1812-1825 (cycle 22: 1989 February-1990 January). Strips of synoptic magnetic maps are for the belt S0 $^\circ$ -S40 $^\circ$ for CR 1817-1823 (1989 June-1989 December).
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1833fig5.eps} \end{figure}$	Figure 5: Same as Fig. 1 but for the southern hemisphere during CR 1836-1848 (cycle 22: 1990 November-1991 October). Strips of synoptic magnetic maps are for the belt S0 $^\circ$ -S40 $^\circ$ for CR 1837-1843 (1990 December-1991 June).
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