Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The potential of many-line inversions of photospheric
  spectropolarimetric data in the visible and near UV   Our knowledge of the lower solar atmosphere is mainly obtained from
spectropolarimetric observations, which are often carried out in the red or
infrared spectral range and almost always cover only a single or a few spectral
lines. Here we compare the quality of Stokes inversions of only a few spectral
lines with many-line inversions. We investigate the feasibility of
spectropolarimetry in the short-wavelength range, 3000 \AA{} - 4300 \AA{},
where the line density but also the photon noise are considerably higher than
in the red, so that many-line inversions could be particularly attractive in
that wavelength range. This is also timely because this wavelength range will
be the focus of a new spectropolarimeter in the third science flight of the
balloon-borne solar observatory SUNRISE. For an ensemble of MHD atmospheres we
synthesize exemplarily spectral regions around 3140 \AA{}, 4080 \AA{}, and 6302
\AA{}. The spectral coverage is chosen such that at a spectral resolving power
of 150000 the spectra can be recorded by a 2K detector. The synthetic Stokes
profiles are degraded with a typical photon noise and afterwards inverted. The
atmospheric parameters of the inversion of noisy profiles are compared with the
inversion of noise-free spectra. We find that significantly more information
can be obtained from many-line inversions than from a traditionally used
inversion of only a few spectral lines. We further find that information on the
upper photosphere can be significantly more reliably obtained at short
wavelengths. In the mid and lower photosphere, the many-line approach at 4080
\AA{} provides equally good results as the many-line approach at 6302 \AA{} for
the magnetic field strength and the LOS velocity, while the temperature
determination is even more precise by a factor of three. We conclude that
many-line spectropolarimetry should be the preferred option in the future.

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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas