Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solar Activity: Triennial Report of IAU Commission 10 (2006-2009)   Commission 10 deals with solar activity in all of its forms, ranging from the
smallest nanoflares to the largest coronal mass ejections. This report reviews
scientific progress over the roughly two-year period ending in the middle of
2008. This has been an exciting time in solar physics, highlighted by the
launches of the Hinode and STEREO missions late in 2006. The report is
reasonably comprehensive, though it is far from exhaustive. Limited space
prevents the inclusion of many significant results. The report is divided into
the following sections: Photosphere and Chromosphere; Transition Region; Corona
and Coronal Heating; Coronal Jets; Flares; Coronal Mass Ejection Initiation;
Global Coronal Waves and Shocks; Coronal Dimming; The Link Between Low Coronal
CME Signatures and Magnetic Clouds; Coronal Mass Ejections in the Heliosphere;
and Coronal Mass Ejections and Space Weather. Primary authorship is indicated
at the beginning of each section.

2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th