Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physical implications of INTEGRAL/SPI gamma-ray line measurements of the
  2003 October 28 solar flare   The very powerful X-class solar flare of 2003 October 28 was detected with
the INTEGRAL spectrometer as an intense gamma-ray flash of about 15 minutes.
Despite the non-standard incidence of the solar gamma-rays, time-resolved
spectra including several nuclear gamma-ray lines were obtained. Such a
measurement with a high-energy-resolution instrument can provide valuable
information of the isotopic abundances of the ambient solar material, as well
as the composition, directionality and energy spectra of the accelerated
nuclei. First results on the measured gamma-ray line ratios and time history of
the neutron-capture line are presented.

26
The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th