| Name | Sajal Kumar Dhara |
| Affiliation | Istituto Ricerche Solari Locarno (IRSOL) |
| Title | Observations on the spatial variations of the Sr i 4607 Å scattering polarization signals with ZIMPOL |
| Authors | Sajal Kumar Dhara |
| Abstract | The Sr i 4607 Å spectral line shows one of the strongest scattering polarization signals in the visible solar spectrum. The amplitude of this polarization signal is expected to vary at granular spatial scales, due to the combined action of the Hanle effect and the local anisotropy of the radiation field. At present, few detections of such spatial variations have been reported due to the difficulty of these measurements, which require combining high spatial, spectral, and temporal resolution with increased polarimetric sensitivity. Using the Zurich IMaging POLarimeter (ZIMPOL) system mounted at the GREGOR telescope and spectrograph in Tenerife, Spain, we carried out spectro-polarimetric measurements in the Sr i line at different limb distances, from μ = 0.2 to μ = 0.8, on the solar disk. Spatial variations of the scattering polarization signal in the Sr i 4607 Å line, with a spatial resolution of about 0.66 |
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