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Title: Observations of the forward scattering Hanle effect in the Ca I  4227 Å  line
Authors: Bianda, M
Ramelli, R
Anusha, L. S
Stenflo, J. O
Nagendra, K. N
Holzreuter, R
Sampoorna, M
Frisch, H
Smitha, H. N
Keywords: Magnetic fields;Polarization;Scattering;Sun: chromosphere
Issue Date: Jun-2011
Publisher: EDP Sciences
Citation: Astronomy & Astrophysics, Vol. 530, L13
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.
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Appears in Collections:IIAP Publications

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