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Observations of the forward scattering Hanle effect in the Ca I 4227 Å line
| Content Provider | Indian Institute of Astrophysics |
|---|---|
| Author | Bianda, M. Ramelli, R. Anusha, L. S. Stenflo, J. O. Nagendra, K. N. Holzreuter, R. Sampoorna, M. Frisch, H. Smitha, H. N. |
| Description | Chromospheric magnetic fields are notoriously difficult to measure. The chromospheric lines are broad, while the fields are producing a minuscule Zeeman-effect polarization. A promising diagnostic alternative is provided by the forward-scattering Hanle effect, which can be recorded in chromospheric lines such as the He i 10 830 Å and the Ca i 4227 Å lines. We present a set of spectropolarimetric observations of the full Stokes vector obtained near the center of the solar disk in the Ca i 4227 Å line with the ZIMPOL polarimeter at the IRSOL observatory. We detect a number of interesting forward-scattering Hanle effect signatures, which we model successfully using polarized radiative transfer. Here we focus on the observational aspects, while a separate companion paper deals with the theoretical modeling. |
| Starting Page | 1 |
| File Format | |
| ISSN | 00046361 |
| Volume Number | 530 |
| Journal | Astronomy & Astrophysics |
| Language | English |
| Publisher Institution | EDP Sciences |
| Access Restriction | Open |
| Subject Keyword | Magnetic fields Polarization Scattering Sun: chromosphere |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
