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Table 1.

Hemispheric asymmetries for solar cycles 12–24.

Cycle tmax Max. Max. Max. Rate Rate Rate Cumul. Cumul. Predom. Diff. ΔtN ΔtS ΔtN − S
No. ISN N S ISN N S N S Hem. [%] (mon) (mon) (mon)
12 12/1883 128 63 84 5.3 4.4 4.6 3258 4409 South 35.3 −27 −1 −26
13 08/1893 148 64 97 7.1 5.6 5.3 4125 5090 South 23.4 −13 0 −13
14 10/1905 105 74 56 4.3 3.7 3.2 3778 3674 North 2.8 1 18 −17
15 08/1917 184 102 79 13.6 6.6 7.4 4918 3920 North 25.5 0 1 −1
16 06/1928 135 67 74 9.0 5.5 4.4 4391 3916 North 12.1 2 −7 9
17 05/1937 199 128 106 9.3 8.3 5.8 6033 5996 North 0.6 2 14 −12
18 06/1947 225 109 125 10.2 6.6 7.4 6658 6630 North 0.4 27 −1 28
19 11/1957 293 168 141 13.6 8.6 9.1 9516 6741 North 41.2 17 −6 23
20 02/1969 157 92 78 7.7 5.1 4.2 6732 5222 North 28.9 0 12 −12
21 11/1979 235 126 122 9.0 7.0 7.1 6889 7146 South 3.7 −2 5 −7
22 09/1989 216 111 124 12.8 8.8 5.8 5839 6780 South 16.1 −1 22 −23
23 11/2001 184 92 98 8.0 4.6 4.7 5731 6514 South 13.7 −16 4 −20
24 03/2014 117 64 82 7.3 5.3 5.6 3412 3126 North 9.2 −29 −1 −28

Notes. We list the cycle number, the time of the cycle maximum tmax in terms of the 13-month smoothed ISN, the amplitudes of the cycle maxima in the ISN as well as north and south HSN, the peak growth rate during the cycle rise phase (in units of month−1) for the ISN, north and south HSN, the cumulative sunspot numbers for the northern and southern hemispheres, the predominant hemisphere, the relative difference between the cumulative sunspot numbers of the two hemispheres, the time difference between the cycle maximum (ISN) and the north HSN (ΔtN) and the south HSN (ΔtS) as well as the time difference between the HSN maxima (ΔtN − S). For cycles where the difference between the cumulated HSN is < 1%, we give the predominant hemisphere in italics.

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