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| Paper: |
Stokes V Asymmetries in the Quiet Sun |
| Volume: |
455, 4th Hinode Science Meeting: Unsolved Problems and Recent Insights |
| Page: |
271 |
| Authors: |
Viticchié, B.; Almeida, J. S.; Moro, D. D.; Berrilli, F. |
| Abstract: |
Stokes profiles emerging from the magnetized
quiet photosphere and observed by the Solar Optical Telescope (SOT)
spectropolarimeter (SP) aboard the Hinode satellite present a
large variety of complex shapes. These are indicative of unresolved
magnetic structures and/or gradients along the line of sight that have
been overlooked in the inversion analyses performed so far. The
interpretation of the complex shapes of SOT/SP Stokes V profiles for
the understanding of the quiet Sun magnetism must be seriously
considered in the near future. In fact, Stokes V profiles
significantly deviating from an antisymmetric shape are rather common
in the quiet Sun and, in particular, in intranetwork (IN)
regions. Here we present the results of the analysis of the shapes of
SOT/SP Stokes V profiles performed through a
k-means classification. Such an analysis aims at defining
different profile classes representative of SOT/SP polarization
measurements. We found that about 35 classes can be defined from
quiet Sun measurements. Among these, two main subsets can be
recognized: network profiles and IN profiles. Approximately 34%
of quiet Sun profiles present important asymmetries. From such
results, it follows that new inversion techniques able to reproduce
line asymmetries must be considered in future analyses of
Hinode SOT/SP measurements. The number of line shapes to be
reproduced by such analyses is finite and small. |
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