EAS Publications Series
Volume 55, 20124th French-Chinese Meeting on Solar Physics - Understanding Solar Activity: Advances and Challenges
|Page(s)||59 - 63|
|Section||Magnetic Field and Polarization Measurements and Theory|
|Published online||27 June 2012|
M. Faurobert, C. Fang and T. Corbard (eds)
EAS Publications Series, 55 (2012) 59-63
Forward-scattering Hanle effect in the solar Ca i 4227 Å line
UNS, CNRS, OCA, Laboratoire Cassiopée,
Nice Cedex 04,
2 Indian Institute of Astrophysics, Koramangala, Bangalore 560 034, India
3 Istituto Ricerche Solari Locarno, Via Patocchi, 6605 Locarno-Monti, Switzerland
4 MPI für Sonnenforschung, 37191 Katlenburg-Lindau, Germany
5 Institute of Astronomy, ETH Zürich, 8093 Zürich, Switzerland
High sensitivity spectropolarimetric observations of the four Stokes parameters of the solar Ca i 4227 Å line have been performed in October 2010 at IRSOL with the ZIMPOL polarimeter, near the disk center, outside an active region (Bianda et al. 2011). They were analyzed in Anusha et al. 2011 with a combination of detailed radiative transfer modelling of the Hanle effect for the linear polarization and weak field Zeeman approximation for the circular polarization. This approach made possible a unique determination of the magnetic field vector at various positions along the slit of the spectrograph. A summary of the observations and of their analysis is presented here.
© EAS, EDP Sciences 2012
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