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Figure 1: Butterfly diagram from 1874 to 2005 based on data from the Royal Greenwich Observatory up to 1976, from the former Soviet Union between 1977 and 1985 and from the Mount Wilson Solar Observatory from 1986 onward. The vertical dashed lines mark the official minima of the sunspot cycle, the inclined solid lines our estimates of the boundaries between individual cycles. Cycle numbers are marked at the top of each cycle. |
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Figure 2:
Two examples of the latitude distribution of the cycle-integrated sunspot area.
a) cycle 12, b) cycle 19 (dots). The solid lines represent 5![]() |
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Figure 3:
Relationships between parameters describing the latitude dependence
of the sunspot distribution. In the three columns we plot results obtained
for the northern hemisphere (left), the southern hemisphere (middle) and the
parameters averaged over both hemispheres (right). From top to bottom we plot
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Figure 4:
Difference between correlation coefficients ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Figure 5:
Latitude distributions of the cycle-integrated sunspot area.
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Figure 6: Butterfly diagrams for the northern hemisphere produced by 5 simple dynamo models described in the text. Shown are contours of field strength, with negative fields being indicated by dashed contours. Time is measured in units of diffusion time. |
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Figure 7: Latitude distribution of cycle-averaged magnetic flux above the threshold for each of the 5 considered dynamo models. Plotted is the distribution averaged over all cycles (thick curves), as well as the distributions due to the strongest and weakest analysed cycles. |
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Figure 8:
Difference between correlation coefficients ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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