Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coronal magnetic field and the plasma beta determined from radio and
  multiple satellite observations   We derived the coronal magnetic field, plasma density, and temperature from
the observation of polarization and intensity of radio thermal free-free
emission using the Nobeyama Radioheliograph (NoRH) and extreme ultraviolet
(EUV) observations. We observed a post-flare loop on the west limb 11 April
2013. The line-of-sight magnetic field was derived from the circularly
polarized free-free emission observed by NoRH. The emission measure and
temperature were derived from the Atmospheric Imaging Assembly (AIA) onboard
Solar Dynamics Observatory (SDO). The derived temperature was used to estimate
the emission measure from the NoRH radio free-free emission observations. The
derived density from NoRH was larger than that determined using AIA, which can
be explained by the fact that the low temperature plasma is not within the
temperature coverage of the AIA filters used in this study. We also discuss the
other observation of the post-flare loops by the EUV Imager onboard the Solar
Terrestrial Relations Observatory (STEREO), which can be used in future studies
to reconstruct the coronal magnetic field strength. The derived plasma
parameters and magnetic field were used to derive the plasma beta, which is a
ratio between the magnetic pressure and the plasma pressure. The derived plasma
beta is about 5.7*10^(-4) to 7.6*10^(-4) at the loop top region.

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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: cond-mat
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The categories of this paper are: supr-con