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Observations of the forward scattering Hanle effect in the Ca I  4227 Å  line

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dc.contributor.author Bianda, M
dc.contributor.author Ramelli, R
dc.contributor.author Anusha, L. S
dc.contributor.author Stenflo, J. O
dc.contributor.author Nagendra, K. N
dc.contributor.author Holzreuter, R
dc.contributor.author Sampoorna, M
dc.contributor.author Frisch, H
dc.contributor.author Smitha, H. N
dc.date.accessioned 2011-06-01T10:06:30Z
dc.date.available 2011-06-01T10:06:30Z
dc.date.issued 2011-06
dc.identifier.citation Astronomy & Astrophysics, Vol. 530, L13 en
dc.identifier.uri http://hdl.handle.net/2248/5488
dc.description.abstract 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. en
dc.language.iso en en
dc.publisher EDP Sciences en
dc.relation.uri http://dx.doi.org/10.1051/0004-6361/201117047 en
dc.rights © ESO en
dc.subject Magnetic fields en
dc.subject Polarization en
dc.subject Scattering en
dc.subject Sun: chromosphere en
dc.title Observations of the forward scattering Hanle effect in the Ca I  4227 Å  line en
dc.type Article en

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