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19 April 2024 |
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Article overview
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Spatial variations of the SrI 4607AA scattering polarization signals at subgranular scale observed with ZIMPOL at GREGOR telescope | | Sajal Kumar Dhara
; Emilia Capozzi
; Daniel Gisler
; Michele Bianda
; Renzo Ramelli
; Svetlana Berdyugina
; Ernest Alsina
; Luca Belluzzi
; | | Date: |
8 Apr 2019 | | Abstract: | Sr I 4607AA spectral line shows one of the strongest scattering polarization
signals in the visible solar spectrum. The amplitudes of these signals are
expected to vary at granular spatial scales. This variation can be due to
changes in the magnetic field intensity and orientation (Hanle effect) as well
as due 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 region. But, the observations
are challenging since both high spatial resolution and high spectropolarimetric
sensitivity are required at the same time. To the aim of measuring these
spatial variations at granular scale, we carried out a spectro-polarimetric
measurement with the Zurich IMaging POLarimeter (ZIMPOL), at the GREGOR solar
telescope at different limb distances on solar disk. Our results show a spatial
variation of scattering linear polarization signals in Sr I 4607AA line at the
granular scale at every $mu$, starting from 0.2 to 0.8. The correlation
between the polarization signal amplitude and the continuum intensity imply
statistically that the scattering polarization is higher at the granular
regions than in the intergranular lanes. | | Source: | arXiv, 1904.3986 | | Services: | Forum | Review | PDF | Favorites | |
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