Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatial variations of the Sr i 4607 {\AA} scattering polarization peak   Context. The scattering polarization signal observed in the photospheric Sr i
4607 {\AA} line is expected to vary at granular spatial scales. This variation
can be due to changes in the magnetic field intensity and orientation (Hanle
effect), but also to spatial and temporal variations in the plasma properties.
Measuring the spatial variation of such polarization signal would allow us to
study the properties of the magnetic fields at subgranular scales, but
observations are challenging since both high spatial resolution and high
spectropolarimetric sensitivity are required.
  Aims. We aim to provide observational evidence of the polarization peak
spatial variations, and to analyze the correlation they might have with
granulation.
  Methods. Observations conjugating high spatial resolution and high
spectropolarimetric precision were performed with the Zurich IMaging
POLarimeter, ZIMPOL, at the GREGOR solar telescope, taking advantage of the
adaptive optics system and the newly installed image derotator.
  Results. Spatial variations of the scattering polarization in the Sr i 4607
{\AA} line are clearly observed. The spatial scale of these variations is
comparable with the granular size. Small correlations between the polarization
signal amplitude and the continuum intensity indicate that the polarization is
higher at the center of granules than in the intergranular lanes.

22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio