Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Century scale persistence in longitude distribution: in the Sun and in
  silico   Using Greenwich sunspot data for 120 years it was recently observed that
activity regions on the Sun's surface tend to lie along smoothly changing
longitude strips 180 degrees apart from each other. However, numerical
experiments with random input data show that most, if not all, of the observed
longitude discrimination can be looked upon as an artifact of the analysis
method.

37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph