Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comparison of the shape and temporal evolution of even and odd solar
  cycles   Results. The PCA confirms the existence of the Gnevyshev gap (GG) for solar
cycles at about 40% from the start of the cycle. The temporal evolution of
sunspot area data for even cycles shows that the GG exists at least at the 95%
confidence level for all sizes of sunspots. On the other hand, the GG is
shorter and statistically insignificant for the odd cycles of aerial sunspot
data. Furthermore, the analysis of sunspot area sizes for even and odd cycles
of SC12-SC23 shows that the greatest difference is at 4.2-4.6 years, where even
cycles have a far smaller total area than odd cycles. The average area of the
individual sunspots of even cycles is also smaller in this interval. The
statistical analysis of the temporal evolution shows that northern sunspot
groups maximise earlier than southern groups for even cycles, but are
concurrent for odd cycles. Furthermore, the temporal distributions of odd
cycles are slightly more leptokurtic than distributions of even cycles. The
skewnesses are 0.37 and 0.49 and the kurtoses 2.79 and 2.94 for even and odd
cycles, respectively. The correlation coefficient between skewness and kurtosis
for even cycles is 0.69, and for odd cycles, it is 0.90. Conclusions. The
separate PCAs for even and odd sunspot cycles show that odd cycles are more
inhomogeneous than even cycles, especially in GSN data. Even cycles, however,
have two anomalous cycles: SC4 and SC6. According to the analysis of the
sunspot area size data, the GG is more distinct in even than odd cycles. We
also present another Waldmeier-type rule, that is, we find a correlation
between skewness and kurtosis of the sunspot group cycles.

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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: cond-mat