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Figure 1: Power spectrum of the daily sunspot numbers. The lower panels are extracts from the upper one, the middle one for periods around 1 year, the lower one shows the rotation range. The dashed line indicates the 99.99%-significance level which is exceeded by one out of 10 000 power values by chance. |
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Figure 2: Wavelet analysis for the cycle pairs 18 and 19 (1944-1965, upper panel) and 22 and 23 (1985-2006, lower panel). The decadic logarithm of the wavelet power is given; periods are synodic periods. The horizontal line marks the period of 27.0 days. The dotted line shows the cone of influence; values below are not reliable (see text). |
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Figure 4: Averages of the wavelet power spectra over 1000 days each in the rising phase (solid line), around maximum (dotted line) and in the decaying phase (dashed line) of the solar cycles. |
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Figure 5: Phase dependence of the sunspot numbers for the Bartels period (27.00 day synodic), averaged for single years. The left column represents the data themselves and the right column the varying part of a sine-fit. |
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Figure 6: Same as Fig. 5, but now for the period of the second high rotation power peak (27.491 d). |
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Figure 7: Variations within the Bartels period, averaged over the maximum period of one solar cycle. The solid lines are the measured distributions, and dashed lines represent the sine fits. The number on the right is the number of the solar cycle. For better visibility, curves are shifted by multiples of 30. |
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Figure 3: Wavelet analysis as in Fig. 2 for cycle pairs from cycle 10 through 23 in color coding. The decadic logarithm of the wavelet power is given; periods are synodic periods. The horizontal line marks the period of 27.0 days. The dotted line shows the cone of influence; values below are not reliable (see text). |
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